1 . First go to your system preferences .
2 . Next choose Keyboard (On the second row ).
3 . On the Keyboard window choose the Input sources tab .
4 . Look for Arabic language and click on add button .
You can also select “Show Input menu in the menu bar” to be able to switch between all added languages via the system menu bar .
So now we have seen how to add an Arabic keyboard on our system but since we don’t have a physical keyboard with Arabic characters attached to our system we need to use a virtual keyboard which can be done very easily with a few clicks of your mouse .