You can't edit other supporters' profile and picture but you can edit your own.
To do this...
Tap on Settings
Choose Edit Profile
The first thing to appear is the fields to edit your name and email. Edit if needed and press Done.
To edit your photo, tap on Change photo. You can either Take a Photo or Choose from your Library.
Tap on Next when you're done.
If you'd like another supporter's details to be edited, please contact the Lumin Support Team at (03) 8899 7525 or email us at support@mylumin.org.