In order to play Australian Football in France, you are required to obtain a medical certificate indicating that you are fit to play ‘football australien en competition’. This certificate is required for insurance purposes. Below is a pro-forma example of a certificate you can use, however any medical certificate indicating the a doctor approves you for ‘football australien en competition’ is fine.
You can book an appointment at any GP in order to have your medical certificate signed off. Services like https://www.doctolib.fr/ allow you to book an appointment online.
Once you have obtained a medical certificate, you can register for the season via HelloAsso (link below)