The following command will get you a running container straight off Docker Hub.
This should display "Hello from Docker!".
Let's login to your container registry. You can get the login URI and credentials from Access keys blade.
Let's first prefix the image with your registry login URI so that it can be pushed to your private registry.
The first command tags the image for uploading to your registry and the second pushes the image.
Let's try to pull the image from your registry. You should find that your image is up to date.
You now have a working Azure Container Registry for your applications!
To learn more about Azure Container Registry visit Azure Container Registry Documentation.