1. Check system requirements by accessing the Apple menu and selecting "About This Mac."
2. Get a Windows disk image by either downloading an ISO (disk image) of Windows 8 or newer from Microsoft, or creating an ISO from a Windows installation DVD or a flash drive.
3. Go to "Applications."
4. Go to "Utilities."
5. Open Bootcamp Assistant in the Utilities folder. The Assistant will walk you through the rest of the process of installing Windows. Once Windows is finished installing, you will be able to switch between MacOS and Windows.