I neet to format my iMac but the errase option is not clickable.

So, I am about to sell my 2011 iMac, but since it came with no disk of instalation, it came with Lion pre-installed, ive been worried about how do I restore it, ive searched a bit and i found that in disk utility you can "format" the HDD and automaticly it will reboot up with the original software... but the option i need is "grey-ish" so i cant click it, like is shown here.
Obviously is in spanish since I live in Mexico, but the boint is that the "Borrar" or "Errase" button is in gray, the "Formato" or "Format" option doesnt let me change the "Mac OS Plus (registered) basicaly I can't do anything, at first i thought it could be something about the password of the iMac, you know? when it promts you to type your password to do something... but there is no lock here to click so i can allow changes, nothing and i really need hel quick.
Thank you.

You cannot erase the startup disk while started from it. You need to restart holding the Command and R keys, you will be on the recovery hard drive, a hidden partition, then you can choose Erase and Install to erase the startup disk and reinstall the operating system.

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