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I am Vinod. I will try my best to help you resolve this issue.
If you are not able to view the above image I attached, check this website, http://www.tothepc.com/archives/ipad-screen-lock-mute-sound-ios-update/
I did find the Screen Lock button you told me about. It didn't help my problem with email not changing from vertical to horizontal. What should I try next?