I cannot use about an inch of the screen where the mail settings are. for example when I log on to face book I cannot change any thing

it's the inch just below the toolbars

Restart or reset your iPhone, iPad, or iPod touch - Apple Support
Working now? If not, ask yourself what may have changed just preceding the misbehavior? Add and App? Update one? Update iOS? Anything.
Use iTunes to restore your iOS device to factory settings - Apple Support
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