You could try it and see what happens...
I did notice in that box you are talking about it says something about disabling the NAT firewall for one computer, have you thought about doing that as you still have a Macafees firewall to keep you safe...Oh and on that subject have configured that properly to allow LW...I would disable that while you are trying to port forward as if you do do it correctly and it's Macafees wall to blame you won't know...
And don't worry I'm sticking with ya...