Joyce M Cody
Firstly you have to sign in your Mac as root administration permission. If it is your own personal MacBook, it is possible you are already administration login.
Many User and developers say Mac Keeper is poorly developed software. Their developer tries very hard to make it better. So it requires you to remove Mac Keeper completely.
Mac requires you to Quit MacKeeper first before deleting. If it is not closed, you can get a message saying: “The item “MacKeeper” cannot be removed because it’s open”.
Again, a warning: if you have used MacKeeper’s encryption feature, be sure to unencrypt before you uninstall MacKeeper.
You must also check any personal files are stored in /Documents/MacKeeper are Backups.