<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div class="container">
<div class="row">
<form class="form-horizontal">
<fieldset>
<legend>Form Name</legend>
<div class="form-group">
<label class="col-md-4 control-label" for="prependedcheckbox">Prepended Checkbox</label>
<div class="col-md-5">
<div class="input-group">
<span class="input-group-addon">
<input type="checkbox" checked="">
</span>
<input id="prependedcheckbox" name="prependedcheckbox" class="form-control" type="text" placeholder="placeholder">
</div>
<p class="help-block">help</p>
</div>
</div>
</fieldset>
</form>
</div>
</div>
