Zebra barcode printers do not install directly to Mac operating systems. A third party print driver called CUPS must be used.
The CUPS driver is usually installed automatically when using the Add Printer function. Installation instructions can be found here: Installing CUPS driver on Mac OSX
Once the CUPS driver is installed, the document settings must be configured. This is done within the CUPS web interface, which must be enabled prior to use.
cupsctl WebInterface=yes
For best quality settings, you should set the printer speed to 2, and darkness to a minimum of 15. Settings can be accessed in the CUPS driver by following these directions from Zebra: https://support.zebra.com/cpws/docs/cups/cups_driver1_4_configure.pdf