Typically this is the result of no images present within the image library for the event.
One image must be added in order for participants to edit their webpage:
- In Sphere, Navigate to Communities>Special Events>Friends Asking Friends>Kintera Thon
- Hover over your event and select Website Info
- Click Image and Text Library for Page Customization
- Click Manage Images
- Browse for an image, name the image and click Submit
- Navigate back to the Webinfo Checklist and click Publish This Event Now