MTV url thing sign up??

Question

ok so i wanted to sign up for the MTV community

http://community.mtv.com/SignUp.aspx?returnPath=http://www.mtv.com/ontv/vma/2008/best-new-artist/&communityUcid=D3FCFFFF0002D51D0002FFFFFCD3

and the 2nd thing down is the url i don't know what to make it bc it keeps rejecting it?? why? i NEED one to sign up...ugh im mad, what should i make it to let me sign up?? plz, help!