You asked these questions in a post but, since they don't have anything to do with the thread, I moved them here and answered them.

Is it possible to close a post or post as answered?
-Members cannot close a thread. Responding to the person who helped you (saying 'thanks') is sufficient and always appreciated.

Do you know where I can fill my signature? I can't find it in my profile.
-New members are not allowed to add a signature. After you've participated in the forums, this limitation will be lifted.