From the Orders screen, you can select one or more orders to perform basic actions on. Tap the ellipse menu in the upper right (the tri-colon, or three vertical dots) to display the Order Actions menu.
The menu contains:
Apply tags to order using the Tag Orders option in the Action menu.
Select the tag(s) you wish to apply to the selected orders.
When you click the Packing Slip or Order Summaries option from the Action menu, you'll see the available print options:
Google Cloud Print
Send via Email
Select your desire print option to print your packing slip or order summary.
The visible print options are found in the mobile app Settings under the Print Methods section.