Make a blank html page with:
<html>
<head>
</head>
<body>
< !--#include virtual="/ubb/cgi/ultimatebb.cgi"-->
</body>
</html>
Set the pathing to fit your setup. This should pull in your ubb, name the page index.html and it will load when they visit your site.
Example:
http://www.yourdomainname.com/ in the root you put the index.html.
For question 2, try
www.ubbdev.com as this require editing some files.
Hope this helps <img src="https://www.ubbcentral.com/boards/images/graemlins/smile.gif" alt="" />