Cairo -
In the upper right hand corner of your browser window, you should see six buttons. On one, the text "user cp" appears. This stands for "user control panel" - ambiguous at best. Click it and wait for the page to load. On the new "user cp" page, look at the strip of options across the top - "My vB Home", "Edit Profile"... that's the one you want. Click "Edit Profile". Half way down the page, there's a large text area. That's where the signature goes. I'm sure you can figure it out from there.
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