Step 2: Install Docker deployment capability
Now that we have added a device, a deployment capability to deploy services needs to be installed. Click on the green button on the right side of your resource and select DOCKER: 
The installation of the deployment capability on your device is triggered and will take some time.

You can see the coressponding job in the Jobs section: 
After the installation job was successful you should see Docker in the Capabilities column of your device: 