http://iscoresports.com/

If a team who wins the game and then forfeits its game do to an ineligible player how do I
Change the results on I-score to reflect the win loss but keep the stats of the players.

You can go back into the game, Undo the last out, add an extra inning to the game (by going to Options on the main scoring screen), then sub in dummy players for the team that one and enter home runs for the dummy players until that team has the lead. Then use Misc -> End Game.