Hello,
Currently the administrator cannot change photos of individual users. However, users can themselves edit it by going to their profile page.
Profile page can be displayed by using shortcode [UPB_profile] . This will show users their profile when accessing this page. There will an “edit” button on this page which will allow users to change/ upload profile photos among other things.
Starting with version 2.0, users can also change image by simply hovering the cursor over photo on profile page and clicking “Change Avatar” link that appears after hovering.
I hope this helps. Let me know if you have any other questions about Ultimate Profile Builder.
Cheers.