You cannot change the app permissions. Your only option is to uninstall.
For background data consumption of third-party apps, you can try Greenify app to force the background apps to close when not in use (https://play.google.com/store/apps/details?id=com.oasisfeng.greenify&hl=en)
Of course, you can also disable background data. But it will affect system features.
You can also disable mobile data when you are not going to use it for next a few hours.
