Well, every day some members ask me about it, "how do I get this title, this and that", so here is a list of how you take the titles.
Posts / Title
0 Guest
4 New member
50 Member-in-training
200 Senior Member
500 Full member
1000 Veteran
And already answered another question that usually comes with this, the title does not influence anything in you to become VIP or amount of "Thanked".