Wait for your W-2. For your 2021 tax return, you (most likely) do nothing other than report the W-2 exactly as received. As the other answer said, the usual way is for $5250 to be tax free and the other $750 to be included as taxable income in box 1 of your W-2. But you said "it shows as tuition taxable on my payslip".
To give you a more precise answer, we need to know:
-How much was tax free and how much was taxable for 2021
- Did you claim an education credit, on your 2020 tax return, based on the $6000 you paid?
You may need to file an amended 2020 return to claim the tuition credit.
