How do you mark enemies in battlefield bad company 2 in ps3?

I have a ps3 and i want to know how do i mark enemies in battlefield bad company 2?|||Keep pressing the select button. Soon you will see were your enemies are and you team will see to. But what i dont know is how to do that in the pc. can anybody tell me how?|||I dont believe its a button i think that the marksman class can designate targets simply by training their scope on them. Then the entire team gets to see their mark|||It is the Select button. If you spam it though, it will impose a 10-15 second cooldown. It's 'Q' for the PC.|||Press the select button|||In the 360 version I hit the back button.|||idk man but the BLOCK IZ HOT!!!! HA HA HOT!