How do i find my Linksys Pword for Wifi?

I got an Ipod touch for christmas and to get wifi i have to go to McDonalds to get it! It says the network it Linksys but i tries to reset the router and it still says admin is not the right pword. I tries to change it on the Cisco page and it says when i connect,that it could not join..PLZ HELP!!!!!!!