internet just got a new wireless router?

[no use for a name 6226]

my last router was broken so i just got a new wireless router i got it all hooked up and everything with my computer but i was going to go on xbox live and it asked for a wep passphrase or something like that so i thought it might have been talking bout the secure key number on the back but aparently it wasnt so how do i find out this password or change it


thank you