Step 1:. Press and hold the Home button
Step 2: Tap task manager
Step 3: Tap End next to an application to close it.
Step 4: To close all running applications, tap End all.
Step 5: Alternatively, press and hold the Home button and then slide left or right until the app is deleted.
or
Step 1: From Front Screen tap Apps button.
Step 2: Scroll left and tap Settings.
Step 3: Tap 'More' tab
Step 4: Application manager
Step 5: Running
Step 6: Select the application you wish to stop
Step 7: Force stop