How to Use a USB Camera Instead of iSight (3 Steps)

Connect the USB cable attached to the external webcam to an available USB port on the computer. Allow 10-15 seconds for the computer to recognize the external webcam.
Select the 'Photo Booth' program, a program that uses the webcam to show you live video of yourself, from the applications dock at the bottom of the screen. Select 'Camera' from the options at the top of the screen.
Select the external USB webcam from the list of options from the menu. The computer will switch from the default iSight webcam to the external webcam. Because Mac programs are all in sync with one another, these settings will be used for all other installed programs on the computer.
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How to Use a MacBook Camera (11 Steps)

Navigate to the Applications folder in the Finder, then double-click on the Photo Booth application icon. When Photo Booth opens, you should be staring at a live image of yourself taken by the iSight camera.
Click on the red camera icon directly beneath the image. The app will provide a three-second countdown and will then snap a still photo through the iSight.
Click on the new photo that has just been dropped into the line of photos below the live image. A strip of menu icons should appear. Click on the various icons to either use the newly created image in a new email, import the image into iPhoto, make the image your new Account Picture, or make it your new Buddy Picture in iChat.
Click on the grayed-out camera icon, and it will turn red to let you know this function is active again. Click on the gray filmstrip icon to the left of the camera icon. The camera icon will turn into a video camcorder icon. Click this icon to begin shooting video with the iSight camera.
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How to Use Photobooth Effects on Skype

Download and install the CamTwist application.
Launch Skype and log in to your account. Click the 'Skype' menu in the main toolbar and select 'Preferences.' Click the 'Audio/Video' tab to display a live picture feed from your webcam. Do not close this window.
Launch CamTwist. Double-click the 'Webcam' option in the Video Sources field. This will begin running your webcam through the CamTwist filter.
Return to the 'Audio/Video' tab in Skype's Preferences menu. Click the 'Camera' toolbar and select 'CamTwist.'
Return to the CamTwist application, leaving the video feed from the Preferences menu still visible.
Double-click any effect in the 'Effects' menu to preview the webcam feed in your webcam display. You can access a settings menu for individual effects by highlighting the effect in the 'Adjust Settings' window. You can also stack multiple effects, and each effect can be removed by clicking the 'X' adjacent to the effect in the 'Adjust Settings' window.
Close out of the Skype Preferences menu, leaving the CamTwist window open. Click one of your contacts and place a video call. You can apply new effects and adjust existing effects at any time during the videoconference by making changes in the CamTwist window.
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