How Do I Add the quick registration form to my sites?
You need to add this code between <head> .. </head> in your custom HTML:-
<script type="text/javascript" src="/scripts/prototype.js"></script>
<script type="text/javascript" src="/scripts/script.js"></script>
<script type="text/javascript" src="/scripts/layer.js"></script>
<script type="text/javascript" src="/scripts/ws.js" ></script>
then {%registrationForIndexBlock%} where you want the form to appear.