Often to be able to post in a forum is required that persons register as a member.
To register for an account, it is possible to select the Register button located on the Main menu.
Once registered, all posts made will show the member's username, and each member will be able to edit its own profile with contact details and other informations. Registered members can also have their own avatar and signature which will be shown on each post.
For more information, please see Registering