Hello and welcome! Did you find the help you needed? I see you have 15 posts now, so that actually should be all you need to access the newest chapters of the GB manga -- 15 posts is the quota required to access the Releases section. If you can't see it yet, even after getting 15 posts, then try logging out and logging in again, and it should appear.
We're glad you joined us -- hope you like the community here and that you'll continue to share your interest in Get Backers!