I lived in 3 different rentals in 2019. Do I add them separately? How can I look at the list to check for errors?

Yes, you will add the 3 rented places separately by clicking on Additional home until all 3 are entered then Continue.

To review the list of rentals for accuracy you go to the left side menu to Provincial then Provincial Tax Credit Profile which will bring you back through the information you added about your residences. At the end of your return, TurboTax leads you through a REVIEW of your return to make sure you haven't missed anything.

Thank you for using TurboTax.