How to delete a computer-to-computer network

A while ago, I created a computer-to-computer network and promptly forgot the password - numpty!

That said, I find now that when I wish to connect my iPod Touch and MBP, the default seems to go to this particular network rather than one I create each time with a password I DO remember.

I don't seem to be able to find a screen on my MBP where I can scourge, erase, get rid of this default connection of my own making.

I'm still a bit new to this - I was delighted that I could get the iTouch to talk to the MBP let alone worry about passwords etc.

Or is there a way I can reveal the password for this dratted default connection?

Any help would be appreciated. Thanks

System Preferences - Network - Airport (highlighted on the left side) - Advanced -

On this screen, highlight the one it auto connects to in the box and double click

If you get a pop up about using Keychain, select Allow

Put a check mark next to 'Show Password'