dude
u can definitely port forward,
try
http://192.168.1.1/main.html and go to NAT option there u can enter a new 5 digit port no. and use tcp/udp in drop down option when u entering port.
if u still not finding option to get into the NAT use telnet command in CMD or use third party Telnet software like Putty or u can search other one in google.
i hope, ur prob will bw solved, all the best!