Happy to clarify.
There are a few ways to add images to the donor profile.
1. By default, the profile image is pulled from the user’s Gravatar.com profile. If you want to add the images like you see in our demo, you need to ask your users to create an account on https://gravatar.com/, so they can add an image of themselves and it will display automatically on your site.
2. You can edit the profile image through the Donor Dashboard page: https://givewp.com/documentation/core/donor-dashboard/
You will need to log in as the user first.
3. You may try with this plugin: https://www.ads-software.com/plugins/wp-user-avatars/
This will only work if the Donor profile is connected to a WordPress user profile on the site.
Please let us know if you have further questions on this or need any additional assistance!