If you are having trouble uploading a photo of your star, please follow the instructions exactly as they are written below:
Uploading a photo to a new star:
1. To upload a photo to a new star, start by clicking on the + icon. This should open up a window which is where you will select your star photo. Browse to the photo you would like to use and click open. You should see your star photo appear within the circle.
Editing a photo on an existing star:
If you are trying to edit a photo on an existing star, please visit the following article How do I edit a Star?