In addition, if you want to be a DT2 member, someone in DT1 must add your to his trust list. If you want to become a DT1 member, theymos must add you to it.
Not necessary DT1 must include you to become DT2, numbers of DT2 can include you to become a DT2 also.
I have always thought that a member on this forum can only become DT1 if someone in DT1 add the person to the his or her trust lists until I saw this Huppercase posts not quite long.