Just log out and never look back; there's no way for you to delete it yourself and no reason for any staff to do it for you.
Hi, Generally, there is no big need for you to delete and or 'terminate' your forums account. This hasn't been done too many times in the past and accounts are only removed from the website if the account itself has been compromised or has received multiple forum punishments which would lead to a website ban. Question Answered / Locked :)