If your financial aid has been applied to your account, there will be an amount in the Total Amount Paid box. Enter that amount less the $100 required down payment and less the $30 setup fee into the Additional down payment box and hit enter or tab. Click the Update Schedule button. This will result in three equal payments (you must have at least $130 in financial aid to cover your down payment or you will be responsible for the remaining down payment).
If your financial aid has not been applied or will be applied to your account later, you will be responsible for paying the down payment. Once your financial aid is disbursed, it will be applied to your upcoming payment(s).
See: Do you offer payment plans? Is there a deadline?