Is the modem plugged into the WAN port on the router? Most DSL uses PPPOE for the connection method. This will require you to enter your username and password. Some ISPs need your complete username, including the @ symbol and what follows (most likely the email address they gave you). Some routers make you hit the "apply" button on each settings page (on a small monitor, you may have to scroll down to see the button). And, at some point, you have to save all of your settings. The router will then reset. You may have to reboot your computer after that to get an IP address.