Unable to Run Alternate Shell in Mac OS X

In an effort to learn more about using the command line on my MacBook, I downloaded and installed the "friendly interactive shell", also know as fish (http://fishshell.com/).

I followed the instructions in the following link:

The last step in the above link is:
"Make fish the default shell. Append opt/local/bin/fish to the /etc/shells file. Then open the Accounts System Preferences panel, unlock it, Control-click on your account picture and select Advanced Options. Set the Login Shell to opt/local/bin/fish."

However, it's not working. When I try to run Terminal, I'm getting the following error message:
"You are not authorized to run this application. The administrator has set your shell to an illegal value."

How can I fix this?
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larsrohrConnect With a Mentor Commented:
Contrary to the given directions, make sure you start the path to fish with "/", i.e.:

It should be this way in /etc/shells, and where you've set it as your default shell.
anuneznycAuthor Commented:
Wow. So obvious! And yet I totally failed to start the path with a "/".

Thank you very much!!
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