Wifi pasword forgotten

Eldji,
Try to reset your modem.
Put in a needle 15/20 seconds into the reset button located on the back at the center of the modem. Release it after.
Wait 3,4 minutes to see appear all the lights of the modem.
You'll see on the screen of your computer: Easy Connect
Choose the password ( located back of the modem), white it twice
and your Fizz application will be effective again.
see also, this link:
https://fizz.ca/en/faq/how-can-i-recover-my-wi-fi-password

Restore your Wi-Fi modem to its factory settings
This will reset any changes that have been made to your Wi-Fi modem settings to date. You may also need to reconfigure your devices’ Wi-Fi settings (network name, password, etc.).

Using a small, sharp object, press the modem’s reset button for 10 seconds.
Once your modem has restarted, follow the same instructions you used when you initially installed it.

The default username (Default Wi-Fi network) and password (Default key) for your Wi-Fi network are written on a sticker on the back of your Wi-Fi modem.

Did you try to reset the modem?