On vBulletin, signatures don't retroactively appear on previous posts I believe. That aside, Why didn't you just wait until the next time you posted something to check? Why would no one care that you're posting random things in the wrong sections...that makes the mods' jobs that much more difficult.
I wasn't trying to be hostile towards you, just telling you that starting a new thread is not necessary - both avatars and signatures will be visible in any previous posts as well as future posts. There is also a preview feature. To check if things work on actual posts and not just as preview, simply go onto your profile, then Statistics, then See all posts. Then you can see how it looks with one of your older posts.
I know it is very confusing to find your way around a forum when you are new so I am sorry if I appeared aggressive - I guess I should have put a smiley with it
Hey, welcome Sloane to the forum, you will have fun here. Like Laserbee said, PM any veteran and most will be happy to help, I did and they were great.
@jaseth: Only your avatar will update your previous post, not your signature, it will update if the post already had a signature. But if you posted before you created your signature, those old post will not add the sig. I found this out by testing my Acronyms for the Forum post 91 and 92.
Yeah - that's what I meant about signatures not updating. Sorry if it seemed I was chewing you out - I've just been admin on different forums for a while, and it's somewhat of a pain to clean up threads. The preview signature button is definitely the best way to test out if it works.