Since "guest" is displayed under your username, it appears you don't have the tug username and password saved in your profile.
Follow the directions in this thread:
http://www.tugbbs.com/forums/showthread.php?t=53
I found the review section to be flaky since the new BBS came up, and sometimes have to enter the username & password twice to access reviews, but never for EACH review.
Hopefully this fixes your problem.