You can connect the Zebra Thermal Printer to your Mac by following these instructions:
Mac
Head to System Preferences in the top left corner of your screen.
Click the Printers & Scanners icon.
Click the + button under the Printers window. Click Add Printer or Scanner.
On the page that appears, select the printer you wish to add.
Use: drop-down, click Select Software
In the Printer popup, select Zebra Label Printer. Then click Ok.
Once you click Add, the printer will be saved!
Windows
Download and install your printer driver:
Launch the downloaded file and follow the onscreen instructions.
Once you've installed the driver, unplug and re-plug the printer back into the computer. Your computer should automatically match this printer to the downloaded driver.
Adding your printer:
Head to the Devices and Printers section in your computer's Control Panel.
Click Add Printer and select your Zebra printer from the list that appears.
Follow the prompts.
Configure your printer's preferences:
On the Devices and Printers page, right-click the desired printer then Printing Preferences.
On the Page Setup tab, check that your paper size is set to 4.00" x 6.00".
Head to the Graphics tab and set Dithering to None
Click Apply and Ok, and your printer is ready to print!