To block emails on iCloud, you'll need to use the iCloud website — you can't use the Mail app on your iPhone or iPad.
You can't run iPhone apps on a Mac computer without an emulator, though that will change with a new set of Macs, coming out by the end of 2020.
Before you call your internet provider in a panic, here's how to fix your iPhone or iPad's Wi-Fi in just a few steps. Your iPhone says it's connected, but nothing loads. Your iPad keeps dropping Wi-Fi ...