I have an acttive sub but i am not abkle to post on the forums
Try relogging, it usually refreshes forum account status.
From what I can see you only have Forever characters that are active. At the moment Forever and Burning Crusade Anniversary characters cannot currently be used for posting.
As a workaround you should be able to use as MOP Classic or Modern WoW character, but you’ll likely need to refresh one or more by logging into the game on a qualifying character. Once you log out of the character try logging and back into the forums.