Hold the wall-mount bracket up to the spot on your fireplace mantel where you want it, and then use a pencil or pen to mark the locations for the anchor screws.
Drill holes for the anchor screws in the fireplace mantel, using a power drill with a masonry drill bit. Next, insert plastic anchors into the holes.
Reposition the wall-mount bracket on your fireplace mantel and secure it in place by tightening the screws that came with the wall mounting kit into the plastic anchors in the anchor holes.
Connect the TV bracket included with the wall mounting kit to the back of your flat screen TV, using the included screws and a screwdriver, and then connect the TV bracket to the wall-mount bracket on your fireplace mantel. It should click in place and include a screw for securing the two pieces together.
Route your TV cords on the wall to your audio/video devices to complete the process of mounting your flat screen TV to your fireplace mantlel. If necessary, use zip ties, twist ties, a staple gun and/or masking tape to secure the cords to the wall so they don't get too close to your fireplace.