JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<button id="theBtn" class="btn btn-default">Edit</button>

<ul class="nav nav-tabs" id="myTab">
  <li class="active"><a href="#home" data-toggle="tab">Home</a></li>
  <li><a href="#contact" data-toggle="tab">Contact</a></li>
</ul>

<div class="tab-content">
  <div class="tab-pane active" id="home">
    <fieldset id="homeFieldset" disabled>
      <div class="form-group">
        <label for="name">First Name</label>
        <input type="text" id="name" class="form-control"/>
      </div>
    </fieldset>
  </div>
  <div class="tab-pane" id="contact">
    <fieldset id="emailFieldset" disabled>
      <div class="form-group">
        <label for="email">Email</label>
        <input type="text" id="email" class="form-control"/>
      </div>
    </fieldset>
  </div>
</div>

JavaScript

$("#theBtn").click(function(){
	$("#homeFieldset")[0].disabled = false;
});