Start the "Airport Utility Admin" (found under the Applications>Utilities folder)
Select (single-click) the Basestation to administer from the list of Basestations and click on the "Configure" icon
Enter your password and check the box "Remember this password in my keychain" (this will prevent you having to enter it again the next time)
Click on the "Access Control" button of the bar. In the access control section click on the plus (
) button.
Enter the Airport ID of the computer you're adding and a description for it in the fields provided. (To find the Airport ID of your computer see the article "Where do I Find my Computer's IDs".)
If you're connecting to the Basestation from the computer that's being added then click on the button "This Computer" in order to automatically fill in these fields with its information.
Click "OK"
Click on the "Update" button to save the changes and restart the Basestation. It will take about a minute for the Basestation to come back on-line.
