NOTE: You will need an Apple ID in order to back up your data to iCloud. If you do not have one, you can learn how to create one here: Create an Apple ID
1. Open the Settings app:
2. Click on your Apple ID (at the top, you should see your name):
2. Click on the iPhone/iPad in the list of devices (it should say This iPhone/This iPad). Enter your Apple ID password if prompted:
3. Click on iCloud Backup:
4. If iCloud Backup is not enabled, turn it on. Click Back Up Now:
5. If you have never backed up your phone, this process may take up to 30 minutes, depending how large your backup is.