all custom edge drivers are added in the same way.
you get the link to the author’s “channel”, typically from a thread in this forum, but maybe from a blog post or the device manufacturer or github.
You follow that link and subscribe to the channel.
Then select the specific edge driver you want to have downloaded to The specific hub you want to download it to. (some people have more than one hub with different edge drivers on each.)
The edge driver will then be automatically downloaded to that hub. It usually happens right away, but some people have reported waits of a couple of hours the first time.
And that’s that. After that, the edge driver will show up in the information for that hub in your account. and as long as you are subscribed to it, it will be automatically updated when the author makes updates.
It sounds like you might benefit from reading the community FAQ on edge drivers. The official documentation is pretty sparse.
FAQ: I have no idea what Edge is. Is that a new developer tool? (2022)