I want to have control over my Wi-Fi even though I am away from home so that I can lock and unlock some devices and know what’s connected to it.
You can sort of do it in a roundabout way by remotely connecting to a computer on the network and then going into the router's configuration through there in order to do what you'd like. It's more of a workaround, but I do it all the time.
Anydesk is what I recommend to remotely access your computer - easy to use and works great, just make sure to secure it with a strong password.
You will expose your router to Internet, which is not a good idea.
Follow these steps:
Log to your router -> Admin -> Remote Management -> configure it there
Update: Looks like in the new firmware it was removed for security reasons, but it was there.
There is a Fizz wifi app that allows you to manage your Network remotely I believe : https://fizz.ca/en/wi-fi-technologies
The Fizz app connects to your modem locally while on the same wifi, there's no remote connection.