You will go to the "Deduction" section to add your donations and medical expenses. Find out how to enter your medical expenses here. To see what medical expenses you can claim click here. You can click on the top right of your TurboTax screen and click on "Find" then type in donations- it will bring you to the page to enter your donations.
While premiums paid for private health services plans are tax-deductible, premiums paid for provincial health insurance are not. The CRA will deny your claim if you try to make it for the Ontario Health Premium, as it is public, not private, health insurance.
Here is more important information for you.