Want to reinstall my MacBook Pro (Can't press "Delete" in Disk Utility)

I want to delete my whole MacBook Pro, because I am giving it away. I have already pressed "Delete available space", but I've read on the support page that I have to press the "Delete" button to make the whole MacBook "brand new" in Disk Utility. This is not possible, since the button is grey. I've already spent a couple of days trying to figure this out. It also says that I have to restart my computer, and when the grey screen appears I have to hold Cmd and R, but when I do, nothing happens. Hope someone can help me out.

The button is greyed out because the same disk has the OS that you booted the machine from and deleting a running OS disk does not work because of already open files, etc.
As Niel says, use the Original OS disk or one of the following methods.
Command-R works if either you have a Recovery HD on your HD, or your computer is capable of net boot (aka Internet Recovery). If you do not have a wired/wireless connection and your Recovery HD is damaged for any reason, Command-R will also not work.
Another option is build a Recovery HD on a USB 2.0 Flash drive and boot your machine using it. You may need to power cycle and hold the ALT key to be allowed to boot from the USB.
Once you have booted by any of the above methods which does not involve the internal disk, you should be able to run Disk Utility and erase your internal disk.

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