​@flogillet If you created your Strava account using your Apple ID account, your Strava account will not yet have a password, as you have noted. To create a password on your Strava account, you can use our account recovery tool: https://www.strava.com/account/recover. Provide the email address associated with your Strava account in the tool, and you will be sent a password reset link to that email address. 

If an unfamiliar email address is associated with your Strava account which ends in @privaterelay.appleid.com, the email sent to that address is forwarded by Apple to the primary email address associated with your Apple ID account. 

Once you have successfully used the password reset link to choose a password for your Strava account, you will be able to log in and update the email address associated with your account. 

I hope this advice helps!