Welcome to the forums!
You can find the answer to your question in
FAQ in the upper right corner of you screen. Here is the explanation you will find on titles:
Everyone has a title within the forum. You will notice the title below the Display Name in each post. Some titles are automatically assigned based on the number of posts a user has made, and some titles are assigned by the forum owner to denote official representatives of the company or other VIPs in the forums.
0 Newbie
25 Trainee
50 Adviser
100 Expert
200 Consigliere
400 Master
700 Guru
1200 Legend
1600 Senior Uber-Member
2500 Ultra Hyper-Supra-Member