With the awesomness of new forums comes some sad news.
You'll have to re-register your account.
But DON'T PANIC! Ok, maybe a little. All of your old posts, old follows/followers and such are gone.
Well, Using the internet's Wayback Machine, you can find old posts and copy/paste them for posterity, if you'd like!
This is the link to the last copy of the old Minecats forums, before OVH's billing problems completely destroyed our servers:
Good Luck, and Good Posting! <3