You can’t. You must claim your 2017 T2202A on your
2017 return first, where it will be used to reduce your tax payable for that
year (if there was any). Anything left over from 2017 will carry forward to
2018, where it will again be used to reduce any taxes owing. If you have no
taxes owing, then you don’t get the credit, as it’s a non-refundable. Instead the
tuition will carry forward every year to use against any tax you owe, until
it is used up.
You can make change to your tax 2017 return
through the CRA or ReFile: https://turbotax.community.intuit.ca/replies/2647992