1) You need to activate your account with a link in the welcome/verification e-mail before you can post on the site, add photos to your HT gallery, add movies to your collection, post news comments, user reviews etc.
2) If you have problems with your welcome e-mail, please post and request help in this thread (you can
post in this thread) and a site administrator/moderator will help to authorize you manually. Nowadays a lot of mail servers are very strict and will sometimes treat the welcome/verification e-mail as spam.
Please also notice that as a new member you won't be able to post links and images right away, here's some more info about that: http://forum.blu-ray.com/showthread.php?t=31288