Read/write access on external drive set to none; can't see drive to change

I was learning about profiles and permissions and set the Read/write access on my external drive to none. I wanted to protect my guests from accidentally viewing private files. I thought I was doing it for that profile only, but now I can't see the drive to change it back. I have already tried using the disk utitility and re mounting the drive, but still cannot see the drive icon on the desktop or anywhere. I know the drive is okay because I can see it in disk utility but disk utility says the read/write access is none.
thanks for anyone that can advise me. I'm more of a PC expert, than a Mac expert.
Gary

Follow the instructions in this FAQ which are relevant to your situation; logging in as root is not needed.
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Read/write access on external drive set to none; can't see drive to change

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