Q: how to use I mac webcam

Try the iMac forum.  It would be helpful to know what you are trying or want to do with it.

https://discussions.apple.com/community/desktop_computers/imac_intel?view=overvi ew

AC

Follow the instructions for the software you choose for the need you have. 

Here are some examples that serve some different purposes:

http://support.apple.com/kb/HT2515

http://support.apple.com/kb/HT4319

http://www.econtechnologies.com/pages/ic/imgcast_overview.html

http://www.bensoftware.com/securityspy/

http://www.evological.com/evocam.html

http://beta.skype.com/en/download-skype/skype-for-computer/

You can search the  > App Store... for "webcam" to find others.

Message was edited by: EZ Jim

Mac OSX 10.8.2