Q: How do I close out apps

Double Tap the Home Button... Then swipe the App Upwards.

From here  >  Force the app to close

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

Close Apps

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

2. Swipe up on the screenshot of the app you want to exit.

3. The app will fly off the screen