2004 chve trailblazer\r\ntell me how can i chinge

you need to remove the grill, a small flat head screw driver will do the trick, you will need to push down on the clips under the hood and pull lightly from the head light assembly and grill just comes off. Then you will need to pull up the two clips on the top corners of the head light assembly. this will free up the assembly this way you can easily remove the bulb and replace it.