Unless you donate a certain amount, user titles are based on the amount of posts you make (see below),
once you donate $50+ you can make a custom user title.
Posting Ranks:
0 - 24 = Newcomer
25 - 99 = Member
100 - 249 = Active Member
250 - 624 = Forum Addict
625 - 999 = Apprentice
1,000 - 1,999 = Guru
2,000 - 4,999 = Grand Master
5,000 - 9,999 = Hero
10,000+ = Legend