I've got how to disable everyone's signature, which I do.
I've checked the Quick Links User Control Panel Signature Options.
(Quick Links menu doesn't show up in Chrome, had to switch to IE to see it)
But if you'll notice the "Quick Reply" at the bottom of every page, there's a box for "Show your signature" and in my case it has a check mark in it all the time. So unless I remember to uncheck it, all my posts have that annoying little project919.com banner at the bottom of them.
I know I can edit my signature, eliminate the banner or use spoiler tags but sometimes, maybe when actually starting a thread, I might want the sig to show. Generally however, I don't.
No big deal, just thought I had overlooked an option somewhere.