My school programs must be purchased through the school's provided vendor in order to attend, but it is not the school itself. Where do I input this information?

In the Education section (under Deductions & Credits), you can enter Tuition (reported on a 1098-T or not), Books and any other Education Expenses you incurred.

Be sure to save your receipts.

Click this link for info on Education Credits to help you. 

Enter it as books required to be  purchased from the school. A mandated  vendor is considered as an arm of the school.