If you have an optical drive connected to your computer, you can insert an installation disc to see it in Startup Manager. Double-click or press the Return key to start up your Mac from the volume you selected.Use your mouse or trackpad, or left and right arrow keys to select the volume you want to use.If you don’t see the volume you want to use, wait a few moments for Startup Manager to finish scanning connected drives. After a few seconds, the Startup Manager appears. Immediately press and hold the Option key.Use these steps to choose a startup disk with Startup Manager: Startup Manager allows you to pick a volume to start from while the computer is starting up. Temporarily change your startup disk with Startup Manager The next time you start up or restart your computer, your Mac starts up using the operating system on the selected volume. Select your startup disk from the list of available volumes.Click the Startup Disk icon in System Preferences, or choose View > Startup Disk.
From the Apple menu choose System Preferences.Set the default startup disk You can change the startup disk your Mac automatically uses from System Preferences.
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