I am receiving a warning when I enter CiviCRM which seems to indicate that I have something called "external profile support" set. Where do I find this option enabled? I have looked but cannot find it. I would appreciate an emailed answer if that is possible.
It's in Administer menu » System Settings » Misc, and it's labeled "Accept profile submissions from external sites".
That's a little obtuse, but most system warnings have a link on the System Status page, at Administer menu » Administration Console » System Status. See screenshot: