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 Download Photo Booth Effects (7 Steps)

Access the download by going to http://www.apple.com/downloads. From here, click 'Email and Chat' under 'All Downloads' on the left side of the screen. Then scroll down until you find the download labeled 'More iChat Effects 2.04.'
Click 'Download.' Once the file downloads, the installer will prompt you you click 'Continue' to begin the install of 56 effects for iChat and Photo Booth. The More iChat Effects Installer will open. Click 'Continue' at the bottom of the Installer's Introductory screen.
Verify that More iChat Effects is already checked once the Installation Type screen opens. Select the box next to More iChat Effects if it is not already checked. Click 'Continue' at the bottom of the Installation Type screen.
Click 'Install' at the bottom of the Installation Type screen, and when prompted, enter your computer's password. The password for you computer is not necessarily the same as your Apple password. Use the password that you set up for your computer. Click 'OK.'
Wait while the Installer installs the files to your computer. Depending on the speed of your computer, the installation should take around a minute.
Complete the installation by clicking 'Close' on the Summary screen of the installer.
Restart both Photo Booth and iChat, if the programs are currently running, and click 'Effects.' You new effects will display along with your original effects.
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