Q: how do i turn of apts when device is not in use?

Force close apps

1. Double tap the home button to bring up the multi-tasking view

2. Swipe the app's windows upwards to close

3. The app will fly off the screen

Most apps turn off after a period of non use. You can also turn off Background ?App Refresh in Settings to turn off those that continue to run in the background.

To quit apps Double click the Home button to show the screen with running and recently used apps. Each app icon will have a sample page above it. Flick up on the page (not the app icon) and the page will fly away and the app icon will disappear. This quits that app.

iOS 7 How to Close Apps

Double Tap the Home Button... Then swipe the App (not the icon) Upwards... Tap the Home Button when finished.

From Here  >  http://support.apple.com/kb/HT4211