From the menu select Registries then click Add registry and select Azure as the registry provider.
Complete the form, using the table below as a guide.
Enter the name you'd like to use in Portainer for your registry.
Enter the URL of your Azure registry.
Enter the username you use to log into your Azure registry.
Enter the password that corresponds to the username above.
When the form is complete, click Add registry.
Simply adding a registry will not make that registry available to non-administrator users. Once you have added the registry to Portainer, you will need to add access to the registry within Host / Swarm / Cluster for each environment that needs access.