If the Oasis Internet Cafe is anything like my previous 2 cruises on RCI, then your SeaPass Card acts as your logon. From what I remember, you swipe your SeaPass card in a slot on the keyboard. It will prompt you for your stateroom number. Once you type in your stateroom number, it should log you on once it connects, which may be a few minutes.
I think the charges are something like $0.55 per minute. Again, don't expect the high speed internet you may have at home or at work.
2007 - Majesty of the Seas
2009 - Enchantment of the Seas
2010 - Freedom of the Seas