Is there a way my users under my prosites are able to use the plugins i install?

How do users of my prosite multisite network use the plugins I have installed?? I'm a bit confused on how this works a bit.

I have the plugins installed. But i don't want to network activate them as I only want the users to use them if they want to use the,..

Also, how does the premium plugins work, I set the plugins as premium, but there is no where to turn the plugins on or not in the admin dashbaord of a prosite user :disappointed: