How do I recover iCloud backup On Mary’s iPhone 13

Left2write wrote:

How do I recover iCloud backup On Mary’s iPhone

13

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

If you mean how to restore the phone by using an iCloud Backup, see instructions in Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

Left2write wrote:

How do I recover iCloud backup On Mary’s iPhone 13

There are 2 response telling you how to recover the backup, click on the link provided in those response.