How to move my app to iCloud

You cannot move an app to iCloud. Why do you want to move an app to iCloud? Do you want to remove the app and it’s data completely? If so, tap and hold down on the app icon until the apps wiggle then tap the minus sign or simply select remove app from the pop up menu.

You can also offload apps from the settings in Settings>General>iPhone/iPad Storage. Let the list of apps load and then tap on the app that you want to offload. When you offload an app, you retain the data on your device.

When you delete an app, it remains in your purchase history so that you can download it again when you want it or need it.