You cant as far as I know of. Because I was wondering the same thing. Right now im trying to get EA to let us Edit Existing Boxers Attributes for Offline only. Post here bud and ask for that too. How in th hell they gave Tyson slow hands and Frazier the best chin in the game is beyond me. BTW Im a Mod over there to, I go by CountryBoy1974

Option to Edit Existing Boxers Attributes for Offline Only Plus Offline Exibition Title Mode - Fight Night Round 4 General Discussion - Fight Night Round 4: EA Forums