If you started a 'Work with Client' D49 type then you will receive an email when the first draft is ready, where you can then release it to your client. Once you release it to your client, any comments they make will be sent to the designer. The designer and the client will go back and forth until your client approves the album. At that point you will be notified that the design is ready for ordering/finalizing.
If you started a '1st Draft' D49 then you will need to send your client the design once you have approved it. Follow the steps below to send it.
Hover over the design slot and navigate to the Sharing icon in the middle. From there, select "Send to Client for Comments".
You will receive an email when your client has made comments through the proofing slideshow.