How do I deny a user that has access

I want to deny access to a computer that has access to my network, and has the network key. Is there any way to single out a user and deny access?

If the person is already logged on to wireless and you change the password or key, they will probably be able to stay online until they disconnect from the wireless network. The next time they try to log on, they will receive an error message stating that they have entered an incorrect password.
Ideally, you would find a way to turn off the other computer for a few minutes, then change the password. Then the other computer would not be able to log onto the wireless unless they had the correct password.
I would suggest that you go with the change password / network key route. Things get a bit tricky with the other method outlined below.
"Also, how do you take a computer off the allow list? That might be the easiest way to do it."
The "allow" list is made up of computers that you DO want to be able to connect. If you leave the computer that you DON'T want to connect off the "allow" list, they will not be able to connect.
You will need to enter the MAC address of every computer that you DO want to allow to connect. Any computer that is not on this list will not be able to connect.
Open AirPort Utility, Click Manual Setup
Click the Access tab just below the row of icons
On the MAC Access Control setting, select Timed Access and follow the prompts
See pages 47-48 in the AirPort Network Guide for details
http://manuals.info.apple.com/enUS/Apple_AirPort_NetworksEarly2009.pdf

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