In the Action tab enter a name for the action. Then select Event type in the New condition block and select Item in "not supported" state as the value.
In the Operations tab, enter the subject/content of the problem message.
Click on New in the Operations block and select some recipients of the message (user groups/users) and the media types (or 'All') to use for delivery.
Click on Add in the Operation details block to actually list the operation in the Operations block.
The Recovery operations tab allows to configure a recovery notification when an item goes back to the normal state.
Enter the subject/content of the recovery message.