Power on the Arris TM502G modem and your computer.
Look on the bottom of the modem. An http link is provided. It should look something like "http://192...."
Open the web browser on your computer and type the http address into the URL bar. Press "Enter" and the modem information and features appear on the page.
Adjust any setting you want. If you are asked for a default name and password, it is "admin" for both. After you have finished changing your settings, click "Save" at the bottom of the page to keep the changes.