Here You will Get two kind of options For this:-
First Option - Using Keychain Access
If you don't want to change the password, then you can possibly retrieve the password from the OS X Keychain, as follows:
Run the Keychain Access utility found in \Applications\UtilitiesIn the left-side window, under Keychains, select "login." In the same window, under Category, select "Passwords."
For the Wireless Security Password
Try this one option, Under the "Name" column, look for your Wi-Fi network's Network Name (or BSSID). The base station wireless security password entry will have a "Kind" of "apple airport router network password."Double-click on your network name listing. Click on "Show password."Enter your Mac's administrator account's password.Your Wi-Fi network's wireless security password should not be displayed. Now See another one.
For the Base Station's Administrator Password
Move on another option i.e. Under the "Name" column, look for your base station's name. The base station administrator's password entry will have a "Kind" of "AirPort base station password."Double-click on your base station name listing.Click on "Show password."Enter your Mac's administrator account's password.Your base station administrator's password should now be displayed.
Second Option - Using the Mac AirPort Utility from a Mac
Run the Mac AirPort Utility and Select the AirPort base station, then select Edit option, Now From the AirPort Utility's menu bar, select Base Station > Show Password and userename.
forget username and password of my apple airport router?
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