Ok since i fugure i'm going to get lots of people asking me this, i made a tutorial shape thing to explain hwo to!!
At the frontpage of the site:
Here is the upload module, click the browse button and select the sig picture on your harddrive, then press submit
Now you should see your file listed here, click on it
Copy the URL of the file (highlight - Ctrl+c)
Go to the forums and click the profile link:
A bit down the page you will see the signature box, type it in liek this:
<a href=http://urltoyoursig>
Finaly goto the bottom of the page, and press submit:
