Tap on the person you want to add a photo to.
In the “Info” tab tap the “Edit” button in the upper right corner of the screen.
Tap on the little camera icon shown on the personal photo silhouette.
Select to “Take a photo” or “Choose from library”.
If the person already has a photo and you just want to remove it, you’ll see the option to “Remove current photo”.
Pinch to increase or decrease the size of the photo you selected and drag to position it.
When it looks right, tap “Choose”.