Currently when you click “log in” from the forums it takes you to the arenanet account page. For some reason, it doesn’t consider you logged into the forums even if you do log in there.
the only reason I can post this atm is because I was already logged in to the forums from my phone.
It looks like they’ve fixed that bug. You may need to clear your browser cache and try again.
http://www.reddit.com/r/Guildwars2/comments/3eteva/cant_log_into_the_official_forums/
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