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 ‘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)