There's now a forum search for library articles! Just go to a library article, click the forum tab, and you'll see a search bar. It'll search and return results for Forum topics (threads) as well as posts within the library article.

Click here for an example! http://www.crunchyroll.com/library/Naruto_Shippuden/forum?q=sasuke

I kinda have a problem ...

not with the library forums but with forums in general ...

in some of the forums, I can't post replies!!!

For example: http://www.crunchyroll.com/forumtopic-523028/request-pre-gfx-layout/

When I scroll down there isn't a reply box!!! And I'm a moderator in the group!

hmm that's weird, i see one for you though~ maybe on that page, the image is really big and covers the reply box? dunno.. all ur acct settings look fine to me