Someone set my Canon 7D to use the back button focus, I would like to know how to reset it back

[TCampbell]

See page 217 of your owner's manual.

It's Custom Function IV - 1:  Custom Controls

Watching this video may help:

Also, near the end of the video, Rudy explains how to revert the camera back to factory defaults.

Hope that helps.

[RobertTheFat]

Since it's pretty clear that people aren't going to stop asking questions like this, perhaps Canon should take action to at least make such questions seem sensible. I'd propose that the obvious way to do it would be to stop including instruction manuals with their cameras.

[cicopo]

Agree with Bob. No need for a manual when you can wait hours for someone to answer your question.