how to kill apps

[Ryu]

if you want to kill apps those are running in background follow this.
press home button (if you are already at home screen then no need to press home button)
deep press menu button for few seconds and you will see all those apps those were running in background.
press red button and you good to go
hope this will help.

[Capt.Kangaroo]

or the down button.....

On the home screen, press and hold Menu Button to see all open/running apps.
Press Down button on remote to close them

[Ryu]

thanks captain