Can someone tell me how to edit my signture?

[Blueberry]

I'm on the vB4 Style.

I click at the top right of the page, on the word "Settings."

Then - on the lower left - under "My Settings" there are hyperlinked words that say "Edit Signature." When I click that, I am able to edit it.

I think you are going in through "My Profile" on the upper right, not "Settings."