Question: how to change username and password on arris router?
Answer: First go to a web browser.
Then, in the address bar type, 192.168.100.1.
Press enter, this will bring you to the Arris modem webpage.
Below where it says Arris, status is in a yellow box. To the right of it you will see a wireless tab, click on it.
This will ask you for a username and password: