You have to buy the PS2 internet adapter, which you should be able to buy from wherever you got your PS2 and plug it in to the back of it. There is a network plug-in or a regular modem plug-in on the adapter. Playing with a modem is not as fun because there is serious lag, but fast internet connection (like cable or dsl) is pretty much as fast as playing against the CPU.
The 2004-2005 Shook-up Can of Fury
QB Marc Bulger, Kurt Warner
RB Deuce, Rudi, Michael Pittman
WR Jimmy Smith, Randy Moss, David Terrel
TE LJ Smith
K John Hall