It's good to make enquiry in knowing about the forum and the DT categories, but after understanding the difference and haven received recommended links showing those under each category and why, it is very important that you should know that you can also be served the opportunity with time if you can be patient, committed, hardworking and be a sound contributor of the forum to other members, it may take you some time and quality level of being committed as said earlier and being trusted, yet being a DT or not does not make much difference of you from other members than just the opportunity you have to be among.