You can use Keyboard preferences to change the behavior of the Caps Lock, Control, Option, and Command (x) modifier keys. To open Keyboard preferences, choose Apple () > System Preferences, click Keyboard, then click Modifier Keys and follow the onscreen instructions.
If you use a USB keyboard that isn’t specifically designed for the Mac OS, it may not have a Command (x) or Option modifier key, which are standard on Apple keyboards. If you have a keyboard from another manufacturer:
ÂÂ The Windows key (the icon on the key looks like a Windows logo) is equivalent to the Command (x) modifier key on an Apple keyboard.
ÂÂ The Alt key is equivalent to the Option modifier key on an Apple keyboard.
Using a USB mouse or keyboard from another manufacturer may require software drivers. Check the manufacturer’s website for the latest software drivers.
Using a Wireless Keyboard, Magic Mouse, or Magic Trackpad
If you purchased an Apple Wireless Keyboard, Magic Mouse, or Magic Trackpad with your Mac mini, follow the instructions that came with the device to set them up with your Mac mini.