While at the options screen type in this password "WWF RULES!!!" make sure there are three exclamation points or it won't work or if you want to unlock indivisual wrestlers then type these in:

Hurricane Helms: Stand back!
Lance Storm:Serious
Mighy Molly:Golly Gosh
Shane Mcmahon:Which way!
Stephanie Mcmahon-Helmsley:No!
Kurt Angle:It's true!
D.D.P:BANG
and the last one(s), Test and Booker T:Ta