Sorry for the delayed reply. I don't get around to checking the boards as often as I would like.
The Enter and Escape buttons are mapped to player 2 buttons 7 and 8 respectively. So you should be able to re-program the Player 2 #7 button to enter using the Ultimarc utility on your software disk.
If you don't know how to use the Ultimarc software program e-mail us at: support@dreamarcades.com
If you post your question here, we may not see it.
Regards,
Mike