First you got to choose 'new game', then choose 'season', pick an empty save slot and enter any of the cheat codes below as profile name. Keep in mind, that you got to enter the codes exactly as they are listed below or else they wont work.
Loaded - User Gets An Extra 999999 Cash.
HotRodz - User Unlocks Rocket Cars.
IWantIt - User Unlocks Everything.
FilMeUp - User unlocks all items in the trophy room.