HOW TO enable back button on android device

Can you teach me guys on how to enable back button on android device in order to exit the game
or can you teach me how to add a button as an exit button
THANks in advance

Hey,

1) If you go to Settings > Mobile > UserInput > check "Override Back Button"
2) Next go to Settings > Controls > add a new control named 'BackButton' and bind it to the ESC key
3) Create a new Event -> AddEvent > Input > Keyboard > and choose 'BackButton'
4) As far as making the Android back button exit the app; I believe you'll have to do this with code since there isn't a pre-made block to do this.  Read about how to do that here :  http://community.stencyl.com/index.php/topic,22625.msg174192.html#msg174192