First you will notice a Show Original Memo Item State link.  This will toggle the detail view between what is currently still out on memo and what was orginally placed on the memo.

From the PDF icon you can choose to print the Memo (as it currently is) or with all the initial items.

The gear icon allows you to select an option to Append to this memo which allows you to add additional items to this memo.  An article on how to Append to a memo can also be found in our help center which is linked here.

The gear icon also allows you to Restock from this memo.  This returns an item on memo back into your inventory.  An article on how to Restock from a memo can also be found in our help center which is linked here.

In addition to these options you can also modify the delievery info, notes, reference, and due date.