OK , let's try:
Go to UserCP and here to "edit signature" and here:
1. you can simply write the url of your website: http:// www. yoursite . com (delete spaces)
2. you can type
[ URL = "http : //www . yoursite . com "] your site's name [ / URL ]
(delete all spaces, I've put them there only to avoid it being transformed into a link)
For example:
[ URL = "http://dracula-transylvania.blogspot.com"] Count Dracula - the Truth [ / URL ]
generates the first part of my signature.
hope this helps
all best,
Radu