Here is a link with instrux to close running apps on a Samsung Galaxy smartphone, same info pasted here below. Good luck!
http://www.samsung.com/ie/support/skp/faq/871886Follow the steps below:
1. Press and hold the Home button
2. Tap 3. Tap End next to an application to close it.
4. To close all running applications, tap End all.
5. Alternatively, press and hold the Home button and then slide left or right until the app is deleted.
or
1. From Front Screen tap Apps button.
2. Scroll left and tap Settings.
3. Tap 'More' tab
4. Application manager
5. Running
6. Select the application you wish to stop
7. Force stop
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