How do I embed a WolframAlpha search bar in a webpage?

I'm attempting to make a Wolfram Alpha search box embed in a webpage using html, but it doesn't function. This is what I attempted:

<div id="header" class="left">
            <h3 style="display: inline;"><span> </span><span>Search WolframAlpha</span></h3>
            <form method="post" action="http://ift.tt/1kdLaSz">
                <input type="text" name="search">
            </form>

</div>

Do I need to learn javascript?