So I just bought my first mac today, the 24" iMac, and I'm already having trouble

. After doing all the registration forms, taking my picture and all that, It sends me to the log in screen. Only problem is that the only account available to log in is an account labeled "other..." and it has no picture on it. it requires a log in name and password, but I never set one up. I can't log into my brand new computer and all the support people are not available for a few days because of the holidays. PLEASE HELP!