Pentrazemine

Sorry if this is a stupid question but do I put the command in the on act box or the 'condition' box? and how do I destroy the building cause when I try shooting at it with my rifle...nothing happens.

I'm a noob when it comes to scripting and with Arma in general; but I've noticed that on occasion a tank shell or few will obliterate a nearby building and was hoping if I could manually do that but to all buildings in the nearby area...to simulate that 'warzone' effect of atmosphere. Can anyone tell me a simple way of getting a building to be easier to destroy or have it already destroyed? thanks!