Im sure this has probably been covered before, but I've noticed several users have their website in their signature in strictly text. You can make it a clickable link by adding the url tags similar to how you'd add a link to a forum message.
To do it yourself just remove use this template
[u rl]www.copyyourwebsitehere.com[u rl]
Just remove the space in u rl (making it url)
Sorry if its redundant, just trying to be helpful.