Device IP issues

Hi I'm trying to set up a thing called Port Forwarding and I'm a little bit
confused as to how WinXP attributes IP addresses to both my wireless router
and my ADSL modem. I have a wireless router with the address 192.168.1.1 and
an ADSL router with the address 10.1.1.1

When I refer to various guides on the Internet about how to set up Port
Forwarding I am told to enter the address 192.168.1.1 in my TCP/IP settings
for my wireless connection but in the guide, the 192..... address refers to
the ADSL modem and not the wireless router. Should I just switch the 2
addresses around?
Would really appreciate it if someone could help me make sense of these two
IPs.

Regards.