|You do in the wireless router, not the wirless configuration.|
You access the wirless router ocnfiguration by typing in its web page IP address in any internet browser. The address is usually 192.168.1.1 but could be different. You will also need a user name and password. If iy hasn't been changed the manual will tell you what the default addres is.
Go to a command promt and type ipconfig /all. The address of the router is the default gateway address.