How to Create a Widget Sign Up for Posts by Email
1. Login to Blogger
2. On Blogger dashboard, Select Theme Edit HTMLThen add the below code before the . tag</head>
<style>/* Widget FollowByEmail TLTeam */*,*:before,*:after{-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box}input,select,textarea{width:100%}#subscribe-box p{font-size:14px;color:#767676;margin:0 0 15px;padding:0;line-height:normal}#subscribe-box .emailfield{position:relative;margin:auto;z-index:1}#subscribe-box .emailfield input{background:rgba(255,255,255,.9);padding:13px 20px;color:#aaa;border:1px solid rgba(0,0,0,0.05);font-size:14px;margin-bottom:16px;border-radius:99em}#subscribe-box .emailfield input:focus{color:#222;outline:none;border-color:rgba(0,0,0,0.05);box-shadow:inset 0 0 0 3px rgba(0,0,0,0.05)}#subscribe-box .emailfield .submitbutton{display:block;position:relative;overflow:hidden;background:rgba(255,255,255,.25);color:#fff;width:100%;font-size:15px;font-weight:bold;border:0;margin:auto;box-shadow:0 2px 3px rgba(0,0,0,0.1), 0 2px 4px rgba(0,0,0,0.13);transition:all 0.2s cubic-bezier(0.4,0,0.2,1)}#subscribe-box .emailfield .submitbutton:active,#subscribe-box .emailfield .submitbutton:hover{background:rgba(255,255,255,.35);color:#fff;box-shadow:0 3px 3px rgba(0,0,0,0.1), 0 3px 4px rgba(0,0,0,0.13)}#subscribe-box .emailfield input:focus.submitbutton{color:#fff}#subscribe-box .emailfield form{position:relative}#subscribe-box .emailfield .submitbuttonlabel{position:absolute;top:3px;right:8px;display:inline;padding:8px 12.5px 8px 20px;cursor:pointer;font-size:13px}#subscribe-box .emailfield .submitbuttonlabel svg{fill:#767676;width:22px;height:22px;vertical-align:middle;transition:all .3s}#subscribe-box .emailfield .submitbuttonlabel svg:hover,#subscribe-box .emailfield .submitbuttonlabel svg:focus{fill:#568af5}#HTML98{position:relative;overflow:hidden;padding:20px;border:1px solid #fff}#HTML98:after{content:'';display:block;position:absolute;bottom:0;right:0;width:120px;height:120px;background-image:linear-gradient(50deg,#ff4169,#8b41f6);background-repeat:no-repeat;border-radius:120px 0 0;transition:opacity .3s;opacity:1}#HTML98:before{content:'';display:block;position:absolute;bottom:0;right:0;width:120px;height:120px;background-image:linear-gradient(230deg,#ff4169,#8b41f6);background-repeat:no-repeat;border-radius:120px 0 0;transition:opacity .3s;opacity:1}#HTML98:hover:after{opacity:0}#HTML98:hover:before{opacity:1}#HTML98 h2:after,#HTML98 h3:after,#subscribe-box .emailfield input[type=submit]{display:none}</style>
3. Then go to Layout ➼ Add Gadget ➼ HTML/JavaScript .Add below code
<div id='subscribe-box'><p>Get notifications from this blog</p><div class='emailfield'><form action='https://feedburner.google.com/fb/a/mailverify' method='post' onsubmit='window.open('https://feedburner.google.com/fb/a/mailverify?uri=NguynLmBlog', 'popupwindow', 'scrollbars=yes,width=550,height=520');return true' target='popupwindow'><input required='required' type='text' name='email' onblur='if (this.value == "") {this.value = "Email Address";}' onfocus='if (this.value == "Email Address") {this.value = "";}' value='Email Address'/><input type="submit" id="email-submit" value="Subscribe"/><label for="email-submit"><svg viewbox="0 0 24 24" xmlns="https://www.w3.org/2000/svg"><g transform="translate(2.000000, 3.000000)"><path d="M14.1972579,8.17124146e-14 C17.3979916,0.00978563072 19.990286,2.62120148 20,5.84554455 L20,5.84554455 L20,7.30693069 L19.99354,7.4036631 C19.9466817,7.75161611 19.6506049,8.01980198 19.2923485,8.01980198 L19.2923485,8.01980198 L19.2835029,8.0019802 L19.1721336,7.99309967 C19.0257158,7.96959451 18.889286,7.90013647 18.7831177,7.79318503 C18.6504073,7.65949573 18.5758514,7.47817413 18.5758514,7.28910891 L18.5758514,7.28910891 L18.5758514,5.84554455 C18.5518871,3.41954659 16.6054921,1.45879454 14.1972579,1.43465347 L14.1972579,1.43465347 L5.80274215,1.43465347 C3.39450789,1.45879454 1.44811291,3.41954659 1.42414861,5.84554455 L1.42414861,5.84554455 L1.42414861,12.1544554 C1.44811291,14.5804534 3.39450789,16.5412055 5.80274215,16.5653465 L5.80274215,16.5653465 L14.1972579,16.5653465 C16. 6054921,16.5412055 18.5518871,14.5804534 18.5758514,12.1544554 C18.6163388,11.7890822 18.922975,11.5127474 19.2879257,11.512 7474 C19.6528764,11.5127474 19.9595126 ,11.7890822 20,12.1544554 C19.990286,15.3787985 17.3979916,17.9902144 14.1972579,18 L14.1972579,18 L5.80274215,18 C2.599996,1 7.995093 0.00487110525,15.3808258 -1.42108547e-14,12.1544554 L-1.42108547e-14,12.1544554 L -1.42108547e-14,5.84554455 C-1.42108547e-14,2.61713944 2.59797615,8.17124146e-14 5.80274215,8.17124146e-14 L5.80274215,8.171 24146e-14 Z M4.29443312,5.38692655 C4.48070099,5.36682207 4.6671823,5.42289927 4.81203008 ,5.54257426 L4.81203008,5.54257426 L8.96948253,8.85742574 C9.48880627,9.2678976 10.2192875,9.2678976 10.7386112,8.85742574 L1 0.7386112.8.85742574 L14.8518355,5.54257426 L14.8606811,5.54257426 L14.9473987,5.48291804 C15.2462388,5.30808809 15.6344967,5.37260085 15.8602388,5.64950495 C15.9785304,5.79800076 16.0329385,5.98799536 16.0113373,6.17714498 C15.9897361,6.36629461 15.8939207,6.53887938 15.7452455,6.65643564 L15.7452455,6.65643564 L11.6320212,9.98019802 C10.5861526,10.8280382 9.09540423,10.8280382 8.0495356,9.98019802 L8.0495356,9.98019802 L3.92746572,6.65643564 L3.8513546,6.58355583 C3.61891283,6.32594359 3.59998262,5.92999594 3.821318,5.64950495 C3.93770999,5.50163353 4.10816526,5.40703103 4.29443312,5.38692655 Z"></path></g></svg>36629461 15.8939207,6.53887938 15.7452455,6.65643564 L15.7452455,6.65643564 L11.6320212,9.98019802 C10.5861526,10.8280382 9.09540423,10.8280382 8.0495356,9.98019802 L8.0495356,9.98019802 L3.92746572,6.65643564 L3.8513546,6.58355583 C3.61891283,6.32594359 3.59998262,5.92999594 3.821318,5.64950495 C3.93770999,5.50163353 4.10816526,5.40703103 4.29443312,5.38692655 Z"></path></g></svg>36629461 15.8939207,6.53887938 15.7452455,6.65643564 L15.7452455,6.65643564 L11.6320212,9.98019802 C10.5861526,10.8280382 9.09540423,10.8280382 8.0495356,9.98019802 L8.0495356,9.98019802 L3.92746572,6.65643564 L3.8513546,6.58355583 C3.61891283,6.32594359 3.59998262,5.92999594 3.821318,5.64950495 C3.93770999,5.50163353 4.10816526,5.40703103 4.29443312,5.38692655 Z"></path></g></svg></label><input name='uri' type='hidden' value='NguynLmBlog'/><input name='loc' type='hidden' value='en_US'/></form></div></div>
Press save.
Demo 1 Demo 2
Note : Replace all code marked with NguyennLmBlog with your blog's feedburner ID.
Additional
Determine the ID of the Widget you just created by pressing edit and looking at the extension of that widget URL (mine is HTML11)
After determining the ID, you go to Theme Edit HTML Go to the widget Select the ID of that widget (mine is HTML11)
Change that ID to HTML98, my example is HTML11 HTML98
Save and see the results.
If you have any problems, please comment below.