Your employer only made you a loan. You don't need to account for that, at all. You claim the tuition credit, just like you would if you had paid it, up front, yourself.
in TurboTax (TT), enter at:
Federal Taxes Tab (Personal for H&B version)
Deductions & Credits
-Scroll down to:
--Education
--Education Expenses and Scholarships (1098-T)
