On Flight simulator It will not let me sign up?

When I sign Up every thing works but the passwork. it said it need to be in alphnumeric form.... what is that. ... or is there another place to sign up or what I don't know what to do.

and the thing you sihn up on is gamespy if you don't know the first do you know how to sign up no gamespy

Go to Gamespy find Forgot your password and do it!

Ur welcome

use letters and numbers in your password