Slip the flat end of a pry bar under the top right of the broken or cracked concrete roof tile. Work carefully so you do not damage the surrounding tiles. The pry bar should slightly elevate the tiles above the broken tile.
Slide a flat pry bar under the tile to the left of the broken tile. This should lift the left tile so it is not lying directly on top of the broken tile.
Gently remove the cracked concrete roof tile. You will need to carefully lift the back end of the tile to get it out of place.
Slide the new concrete roof tile in place. Push the back end of the tile far enough so that the front of the tile is flush with the other tiles in the row.
Remove the flat pry bars from under the surrounding tiles. These tiles should rest on top of the new concrete roof tile.