Should you want to change your wireless name or password, you can do this by following these steps:
Connect to the router on a device with a web browser (via wifi or ethernet).
Navigate to 192.168.1.1
Login to the router page
Password - see the access key on the bottom of the router
Click the name of your Wifi network on the left side of the page
You can then edit the "SSID" (Wifi name seen on your devices) and "Wireless Password".
Once you save these settings, your router will disconnect any devices from Wifi as your devices will have to connect using the new name or password. It may take 1 minute to see the new Wifi name on your devices.
If you encounter any issues, you can click cancel, or press the factory reset button on the back of the router. This will restore the router to the original state you received it in with the password printed on the router.