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Sorry, I'm new to the FICO community.
And what are the ranks and needed posts to get there lol.
If you'd like to change your FICO Forums username from Envidia17 to whatever, you can certainly do so. I'd suggest contacting a Forums Administrator like Barry or Mod-Moose and they can hook you up with a name that's not taken.
With regards to the community rankings, here's a handy chart showing those rankings:
http://ficoforums.myfico.com/t5/User-Guidelines-General/FICO-Forums-User-Rankings/td-p/331963