Make sure you are signed in with your Apple ID on your Mac.
As soon as you have an active subscription, Windmill on the Mac will start to distribute your application.
Every time a new commit to your project repository is made, Windmill will distribute a new build for your application. Windmill will only distribute a new build for your application upon a succesful run. This is to ensure that you never end up with a broken version.
Tip: Should the distribution of a build fail (e.g. due to a network error):Windmill will try to distribute the build again.
See also Tip: You can Restore a Windmill Subscription under the Account -> Subscription menu. Hold ⎇ and select Restore Subscription.