Basically, because you are a limited member, it means that you cant access some areas of the forum, such as viewing member profiles. You have to have 50+ posts to be able to have full members status, meaning that these messages will dissappear.

You have 7 posts, 43 more to go...

You also have to have 100+ posts to be able to apply for the private sisters section, where only sisters can access that area. You wont be able to apply for the brothers section.

So, you dont have to do nothing, except post...

hope that helps...