I'm confused by your question. You refer to iOS 6, but have posted in a forum for Mac OS X. Are you trying to do this from your iPad? If so, you'll be more likely to get a quick and applicable response if you post in the iPad forum. If you're referring to your Mac, which version of Mac OS X are you really running, 10.7 as would be indicated by the forum you chose, or 10.5.6 as shown in your profile?
Do you see the icon with the arrow in the toolbar in Preview? If so, click that and you should get an email option.
If you don't see that icon, right-click on the Toolbar, select Customize, and drag the icon into the toolbar.
If that doesn't help, or clicking "email" doesn't work, you might want to ask for further assistance in the OS X 10.8 Mountain Lion forum.
Message was edited by: varjak paw