Issue: Access Denied

Well.. This is my problem. As I was trying to write a review for a certain manga, it seems that I can't go through. It keeps asking to log in, but I'm logged in already. Then when I try to log in it suddenly states that my username and password was not registered. when i try to click the register it shows that I do not have permission or something like that. Gosh.. I'm a bit frustrated..

A little help!!

Thanks in advance!!!!

nesxia