After you've whitelabeled your delivery email within Settings in the Single dash...
1. Choose which digital release you would like to test the delivery of
Hint: If you click in the search field, click space bar then backspace - you will see a list of the releases in your store.
2. If you're including a Boostlink with purchases, select one from the dropdown
3. Click "Send Test Email." This should arrive immediately to the email address you're logged into Single with.