How to Configure an iMac Camera With Yahoo Messenger

Open the Internet browser on your iMac and navigate to messenger.yahoo.com. Click the Download tab in the top-left corner of the screen, then click Download Now to confirm and download Messenger to your computer.
Click on the Applications folder on your computer's desktop and open Yahoo Messenger. Set up your account by entering a user name and password, then logging in to your account.
Click on Webcam from the list of headings in the top bar of your computer. Choose Start Broadcast from the list of options in the drop-down menu. The Photo Booth application program will now open on your iMac.
Confirm that the camera image is to your liking by choosing effects and settings from the list of options in the main Photo Booth screen.
Select a contact from your list of friends or perform a search for a new contact in the Messenger window and begin to chat. Your iMac's iSight camera is now configured to Yahoo Messenger and you can transmit video to your contacts.
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