I follow the directions here for port forwarding: http://portforward.com/english/routers/ ... ys/WRT54G/
I arrive at the page that looks something like this:

When I check my IP address using various sites, it shows as 25.8.13.103
I don't know what I'm supposed to put in the blank box as my IP address. The IP address I'm supposed to put there clearly begins with "192.168.1."
I don't understand how I can have multiple IP addresses on the same computer or how I would find this one, which I need in order to forward port 5900.
I can't find the answer online; so any assistance would be greatly appreciated.