like this Working demo http://jsfiddle.net/7e2XU/21/show/# * Update: http://jsfiddle.net/kz5kjmbt/
<div class="container">
<div class="row" style="padding-top: 240px;"> <a href="#" class="btn btn-large btn-primary" rel="popover" data-content='
<form id="mainForm" name="mainForm" method="post" action="">
<p>
<label>Name :</label>
<input type="text" id="txtName" name="txtName" />
</p>
<p>
<label>Address 1 :</label>
<input type="text" id="txtAddress" name="txtAddress" />
</p>
<p>
<label>City :</label>
<input type="text" id="txtCity" name="txtCity" />
</p>
<p>
<input type="submit" name="Submit" value="Submit" />
</p>
</form>
data-placement="top" data-original-title="Fill in form">Open form</a>
</div>
</div>
JavaScript code:
$('a[rel=popover]').popover({
html: 'true',
placement: 'right'
})
ScreenShot