If you haven't already gotten help I'd contact one of the moderators. It shows on the home page who moderates each forum so you should be able to contact them through there.
When you change your email you have to confirm that change with a link sent to the original email address. It does appear that you have done that so your account should be fully active and there is no apparent reason why you can't post on any of the forums here.
If you are still having problems please let me know.