How can i add "AD"<ins> in index.htlm

I want to add banner AD in my html game.
So i tried to apply this code in my game
--------------------Ad script-------------

Readme said i should add this above .
So i added at there. but when i start gaem, i can’t see the add. Only i can see the game.
How can i add above Ad scrpit in my html5 game.
please help me.
Or is there any way i can add Ad in my html5 game?