When I attempt to erase my hard drive, I am unable to select the "security options" tab?

I wish to erase my hard drive and for the contents of the hard drive to be unrecoverable. In order to do this, I have done some research and I believe there is a tab called "security options" when I go into "Disk Utility" and click "Macintosh HD." This tab is indeed there for me, however, I am unable to click it. What I mean by this is basically when an option is there but you simply cannot click it because... well, yeah, that's exactly my problem! I don't know why I'm unable to click it.
Thanks in advance!
Message was edited by: RyanValmont

Do a backup. Boot to the Recovery Volume (command - R on a restart or hold down the option key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair and Repair Permissions. Then select the Erase tab. Format is Mac OS Extended (Journaled). Select Secure at the level you want. Erase and then reinstall the OS.
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When I attempt to erase my hard drive, I am unable to select the "security options" tab?

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