You can use the Storage Account page to add a description for the Storage Account resource for the target Azure platform.
In the Web Interface toolbar, select the Platforms tab.
Select the target platform, then select the Storage Accounts tab under Associations.
In the Storage Accounts list, select the resource, then click Edit (or double-click the storage account) to open the Edit Datastore dialog.
Modify the Description for the resource.
Click Save to update the Storage Account resource.
Click Close to exit the dialog.