How To Make The Player Die ?

That the player falls to the floor he just slips from side to side and does not die I want him to come on the floor he will die How can I do that?

 

select the yellow bar below by clicking on it, then click it again until it turns red. yellow for collision, grey no collision, red will kill the player

 

hey man !
I cant select the yellow bar
cntrl / alt doesnt work ..
can you pls help me ?

 

I didnt say anything about cntrl/alt. Just click on the bar to change the colour

 

thanks man i fixed it !
i just needed to tap on the "Show game frame" up there and then click the yellow bar
thank you anyway and have a nice day !