Hmm. All members can write in the forum unless they have been muted.
I don't know why you haven't been able to successfully change your email. Did you look in your spam filter for the email confirmation?
I guess I would continue trying to reach support directly (not here).
I am not sure, this problem is solved. I reported a bug that my new email adress can't store in the configuration and for that reason I don't receive a activation mail. AND I still do not see the new adress, but the old one.
Now i am suddently a Diamond member without the activation problem. As you can see I can now write in the forumm what was before impossible. But what happens when I am back to a free membership?