To print using the ZPL format, you'll first need to set your default label format to ZPL in your Shippo Settings. Please reference Navigating the Labels Page.
For Mac users, please reference How to print shipping labels in ZPL format.
ZPL Printing for Windows users
Navigate to the Zebra website and search for your Zebra printer model in the search box.
In the search results, click on the line with the title that contains Printer Support.
Click on Drivers and then click Download for the latest available Zebra driver for Windows.
Click the Accept and Begin Download Now button.
After downloading, open Zdesigner software and click on the Open Communication with Printer button.
Click the Open File icon and select a ZPL label file from your computer.
Click the Send to Printer button.