1. Navigate to Communities > Special Events > Friends Asking Friends > Kintera Thon
2. Hover over Thon Name and click Website Info
3. Click Event Text
4. Click Advanced Confirmation Setup
5. Click Edit by registration/donation/volunteer confirmation
6. Click Custom > Edit Email
7. Click Custom Profile Fields (yellow can with an Pf on it)
8. Change drop down to Custom Profile Fields
9. Select desired field
10. Save