Connection between two routers (without Wlan)

I have a new modem (with integrated router, without Wlan),
I plugged the cable router Linksys WRT54GL to if, for WLAN is only half the available rate, read the Internet forums that might have to disable DHCP on the router, Wlan and give a static ip, but can not do it.
Does anyone have any idea how to connect everything?
