Currently Being ModeratedFeb 12, 2013 7:00 PM (in response to margoh1)
Welcome to the Apple Support Communities
Apple hasn't released a “Find my iPhone” app for OS X. However, you can access to Find my iPhone on the Mac in http://www.icloud.com, logging in with your Apple ID and choosing Fund my iPhone.
After doing this on your Internet browser, look at the URL bar. At the left of the URL bar, you will see the website icon, so drag it to your desktop to create a shortcut to access to Find my iPhone