Apple MacBook Air (11-inch, Late 2010) - Manual (Page 48)

48 Chapter 3 Problem, Meet Solution
To install Mac OS X:
1 Back up your essential files.
2 Make sure your power adapter is connected and plugged in.
3 Insert the Software Reinstall Drive into one of the USB ports, as shown in the following
illustration.
Important: Don’t disturb or remove the Software Reinstall Drive until the installation
is done.
4 Double-click Install Mac OS X, and then click Restart.
5 After your MacBook Air restarts, choose your preferred language when prompted.
6 Follow the onscreen instructions. In the pane where you’re prompted to select a disk,
select the Mac OS X internal flash storage (in most cases, it will be the only choice
available).