You can add photos/logos on your cause page by following these steps:
1. You go to your dashboard profile
2. Select Nonprofit
3. If you want to change your logo you can either drag your logo picture to this box or click that box to browse your logo picture. AND DO NOT FORGET to click UPDATE button at the bottom of the page.
4. After that, if you want to add photos to your gallery, you can easily click on Gallery tab
5. This page will appear, and you can add photo by clicking "Add Photo" button or just drag your photos to the box.
6. Then, click "Update Gallery"!