Select the guest list from the Manage tab on the dashboard.
Tap the guest’s name that you wish to add a photo for. The guest’s contact card will appear. Tap the avatar above the guest’s name.
Here, you will be informed that you can upload a JPG or PNG file. Also, the image should be less than 1MB in size.
Once a photo is selected to upload, you can crop your image. Select "Done" to save the new photo.