Version 2020 and later
Select the check box beneath Line 30300 on Schedule 5. The Field 58120 on the provincial form (428) will be claimed automatically as well.
Version 2019 and prior
Field 303 is from schedule 5. Field 5812 is from the provincial tax form. Both fields 303 and 5812 have a checkbox on the left side to enable the claim. Check the checkbox to make the claim as shown below: