How Do I Set a Signature?

[Dima]

Edit: Oh... -.-' Yeah there it is. I guess this specific forum saves the signatures as a part of the post.
Another edit: Scratch that, it updates regardless of the post...
Well I get to the Edit Signature thingie, that's fine, but while it shows it over the Current Signature frame, it doesn't show up on the rest of the forum. I ticked the 'Attach signature' box too.