You earn prizes by obtaining donation points. You obtain donation points by getting people to donate to the SKELL-A-THON.
The total of all of your collected donations will be divided by 5, then rounded up or down, to determine your donation points. So if you collect $100 in donations, you would have obtained 20 donation points. The more donation points you obtain, the more prizes you can earn.
Example:
Donations: Add up all of your donations and divide this amount by 5. So, if thirteen people have donated a total of $76.00, then you have 15 donation points (76 divided by 5 = 15, any fractions are rounded).