Right guys, a few of you have been having problems with your signatures, so here's a quick tutorial.
Firstly we want to look at the userbar at the top of the page, we're going to click "Profile"
Wait for your profile to load up, now we want to click "Preferences"
Scroll down a little bit and you will see an option called "Always attach my signature".. Change it from "No" to "Yes".
Save your new preferences and look at your sig in all its glory!
I hope I helped.