setting up a server -1 reply

I am trying to set up a Server bout i think my ruter is sett up the wrong way cous i haw added the seting like this Port Forwarding for the Thomson/Alcatel SpeedTouch 546 says and added my computer to that I think the problem is that i haw the ip 10.0.0.1 and the gateway is 10.0.0.138 is there a way around this whit out canging the ip on the adsl modem? or do i haw to chang the ip on my modem to be abel to set up a game?