The instructions varies depending on your Operating system (OS).
Choose your OS and follow the instructions to create a PRN or PostScript® 3™ file for direct printing. Windows | Macintosh
The screens may vary depending on your application and operating system (OS).
From the menu bar of an application, click File => Print.
Choose Brother [model name] and check the Print to file box. Click Print.
Choose the folder you want to save the file to and enter the file name if you are prompted to.
If you are prompted for a file name only, you can also specify the folder you want to save the file in by entering the directory name. For example:
C:\Temp\FileName.prn
If you have a USB Flash memory drive connected to your computer, you can save the file directly to the USB Flash memory drive. Choose it when saving the file.
Click OK.
The file for direct print will be created.