To change a user's name in the Waldo Photos app, follow these steps:
1. Open the Waldo Photos app and tap the Face icon in the top left of the app.
2. Tap the word "Faces" to bring up a list of your Users and tap on the name of the user you would like to change.
3. Tap on "Go to Settings".
4. Now you can change the First and/or Last name then tap Save in the upper right.