How do I add a banner signature thing?

[RainbowsAtMidnight 7]

Hey everypony! It’s been awhile since I’ve been on here and I feel really bad for that, but I’m returning with a question: how do I add a banner for a signature thingy? I’ve made them before on another forum based rp site, Warrior Cats Online, but I can’t seem to figure out how to do it on here. Can anypony explain how to do this? Thank you so much! 

[RainbowsAtMidnight 7]

Never mind, I figured it out, I wasn’t at a good rank to be able to do it, haha.