I assume you are using the telnet entrence to the router..
instead of entering menu 12, enter 15 on the Netgear RP114 router.
And you should find yourself with a much more correct routing page
Else, you could use the web access to the router, by enter the router's IP in the webbrowser, which will promt a username/password field for you, admin is the username, and the password you know yourself.
navigate to the advanced and ip forwarding menu, and you should solve the rest yourself i guess