Nice to meet you too!
Profile customization is, for some reason that escapes me, unfortunately currently only available to staff. We've been working on opening it up to the members since they're the ones who actually want to use it, but so far no response.
Or if perhaps you are referring to personal profile info, you can edit that in the User CP. The title beneath your username however, is preset until you reach premium (1000 posts). Once you do so, you can change it to whatever you like.