To configure your picklists go to the PREFERENCES option on the menu and choose the PICKLIST OPTIONS tab. The tab has its own detailed instructions, or you can view the help article here.
​

To print a picklist for one order select the "ACTIONS" dropdown and then click Print Picklist

This will generate a PDF that you can send to your printer.
​

​​To generate picklists for multiple orders, select the orders in question using the checkboxes for each order panel as shown below.

After selecting orders a "BULK ACTIONS" dropdown appears allowing you to perform actions for multiple orders

You can reprint picklists as many times as you want.