Click on your first item and slowly drag it to the Boxes section on the right side of your screen
Choose between the 3 options that appear
You can print your box labels individually by clicking the “print” button at the box level. Or by clicking the printer at the top of the page to print them all at once.
Once all are boxed, at the bottom of the page click “Submit Box Content”. Amazon will now have all your box content and you can proceed with scheduling your carrier.
If your items are always packed the same way, you have the option to set it up once and then you can box your whole shipment with a single click of a button.
Below is a quick demo on Shipyard's box content tool