Don't give yourself unnecessary disturbance concerning this, because you can't find a button to use in deleting your account, but to permanently erase this from your memory, log out the forum, delete your browser history, clear the cookies and delete the browser used as well, but the truth concerning this is that you only can acheive deleting it from the device you're using, but not from your head, I still can't find a genuine reason that important for you to made up your mind in deleting your account, just forget about it, your same mind could one day change, just as you had now.