To add a signup form to your website, insert this HTML on your page(s):

<form method="POST" action=""><p>
<input type="text"  name="Email" size="20"><br>
<input type="radio" name="Action" value="join-1111" checked>Subscribe 
<input type="radio" name="Action" value="leave-1111">Unsubscribe</p>
<input type="hidden" name="ThanksURL" value="2222">
<input type="submit" value="Do It">

1. Replace "1111" with the ID of your list.

2. Replace "2222" with the full URL of the landing page on your site which your subscribers will see after submitting the request.

Or, you may link to a page which is hosted here specifically for your list. Use a URL of this form: