I need to erase my hard drive. But the disks are grey when I go to Disk Utility. How can I erase the hard drive?

I need to erase my hard drive. But the drives are grey when I go to Disk Utility.

Restart the computer with the Command and R keys held down and use the Disk Utility from there. If you're going to sell or give away the computer, press Option as well.
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