The immigration medical is sent electronically by the doctors. Find a doctor near you and ask them what do they need.
https://secure.cic.gc.ca/pp-md/pp-list.aspx
Usually, just your passport is enough. After the examination, they will give you a reference number. That document should be uploaded to your profile. In 10 days, the doctors would send your report directly to the IRCC. Based on the reference number, your report will be added to your profile.
Please note that it is valid for 12 months from the date of your medical exam.