Yup, Quaffer's covered it all. I know this will seem stupid that I'm reminding you, but you need to insert your sig into the textbox. Like press that button that puts in that textbox.
Oh my, I've even confused myself =="
Edit: Oh woops. I think I just said what Quaffer said except like, not as well XD. And I see that you've got your sig on now which looks smashing btw ^^