Hey Armen, there is now a new feature on manacube called /link. If you want to link your manacube rank to your forum account, you have to type /link on kitpvp (other servers don't work), then follow the instructions, and you should have your VIP+ tag on the forums.
Hello
if I want to link is always there "Invalid Minecraft username". But the username is right!
My name is Ingame MasterGamer_TV and I bought the VIP rank