Question
 

Hiya mates.

I was just wondering,
I recently purchased a signature donation upgrade, but all posts I made previously do not include my signature. I know how to add the signature to each post individually, by going to that post's edit page and checking the "Show your signature" option, but rather than doing this 200+ times for all of the posts I made prior to my signature upgrade, is there any way to automatically make my signature show for all of my posts?

No, there's not. vB automatically will create a sig on all new posts that you create but not on any prior posts.

Alright, thank you ;)