You can, but you would have to do it on your 2016 tax return. To make changes to your previous year’s returns, you can use the CRA My Account site or do it by mail.
https://turbotax.community.intuit.ca/replies/2647992
More information on the Home Buyers’ Tax Credit:
https://turbotax.intuit.ca/tips/who-can-benefit-from-the-home-buyers-tax-credit-5203
