You just got your WoTLK patched to 3.3.0 something and now when you try loggin in eternion wow it says you need to convert your account from battlenet what should you do

You MUST convert your account to battle.net. It is required to play world of warcraft. There is NO way around it. Go to the Battle.net site linked in the related links section and follow the instructions. It is quick and easy for anyone who can follow simple directions.