Friends Asking Friends Events (FAF) and Sphere Forms do not have an option to add additional fees for processing. 
However, as a workaround, the user can add the desired fee amount to the registration type and add a description stating that registration fee is $XX and the online processing fee is $XX. 
  1. Navigate to Communities > Special Events > Friends Asking Friends > Kintera Thon
  2. Hover over the event and Select Website Info
  3. Click Fee Structure
  4. Click Edit next to the registration type you wish to add the fee to
  5. In the new window that appears increase the amount to include the fees
  6. then in the description add stating that registration fee is $XX and the online processing fee is $XX
  7. Click Save
  8. Navigate back to the WebInfo Checklist 
  9. Click Publish This Event Now