Hi Lisa here, and I'm going to show you how to back up your iPhone to iCloud. First you are going to go to your settings and from there you are going to scroll down until you see iCloud, once you tap on that it will take you to this main screen and from there you are going to scroll down again and you will see a tab that says storage and backup.
You are going to want to click on that and then you scroll down again and you'll see the option to back up now. Now to back up to iCloud you do have to be connected to Wifi and when you are connected to power, wifi and the phone is locked the phone will back up to iCloud automatically. So you go ahead and you can just tap back up now and it will show you a loading bar at the bottom and it will give you an estimate for how long it will take. Once it's done you have a back up that is nice and safe on iCloud. And that's it, that's how you back up your iPhone to iCloud.