How Do I Delete a Wireless Password for Apple Mac?

Open 'Finder.' In your Finder window, navigate to the 'Applications' folder and then into the 'Utilities Folder.' After you've opened the Utilities Folder, find 'Keychain Access.'
Double-click on 'Keychain Access.' When the program opens, you will see a window divided into three panes. Before proceeding, click 'Login' in the Keychains pane at the top left. Immediately below, in the 'Category' pane, click 'All Items.'
Scroll through the list of saved passwords on the right. If you have a large number of passwords, you can sort them according to name or kind to make the list easier to navigate. To resort the list, click on 'Name' to sort alphabetically or 'Kind' to sort by type of password. When you've located the name of the wireless network password you wish to delete, click on that name once to highlight that keychain entry.
Press the 'Delete' key on your keyboard. A dialog will pop up asking you to confirm that you want to delete the keychain. Make sure you have selected the correct keychain entry, because you cannot recover deleted keychain password entries. When you have confirmed the proper entry, click 'Delete' to remove the wireless password you selected.
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How to Connect My Sennheiser Bluetooth Headphones to My MacBook Pro

Open the cover located on the left earcup of the headphones. Connect one end of the charging cable to the socket installed in the earcup. Connect the remaining end of the cable to one of the USB ports located on the left side of the MacBook Pro. Allow the battery to charge for three hours before proceeding.
Disconnect the charging cable from the headphones and computer. Close the cover on the left earcup. Hold down the button installed in the center of the right earcup until the surrounding LED blinks red three times. Press the button again until the LED blinks blue and red in alternating order.
Click on the Bluetooth icon located on the left side of the computer's menu bar. Select the option labeled 'Set Up Bluetooth Device.' Select the headphones from the list of entries and follow the onscreen instructions; when prompted for a passcode, input '0000.'
Check the LED on the right earcup; if the LED is blue, a connection has been established. Repeat steps one through three if the LED is blinking red. Put the headphones on and play a piece of audio to confirm that the device is working.
Locate the two buttons installed near the bottom edge of the right earcup. Press the left button if you wish to toggle the Bluetooth connection on and off. Press the right button if you wish to activate the 'NoiseGard' feature. Press the buttons installed around the LED on the right earcup to adjust the playback volume.
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