How do I Erase a Tile from a Tilemap with a Click?

I been searching all over the Forums,Manual,Google and YouTube for this one simple answer.

How do I erase a tile from a tilemap when I am in game by clicking on it with the mouse?

"

PositionToTileX(x)

PositionToTileY(y)

Convert an X or Y layout co-ordinate in to the corresponding tile number in the tilemap. For example, this can be used to get the tile position under the mouse. "

Am I on the right track?

From the manual:

Tile positions

When using tiles in the object's conditions, actions and expressions, positions are generally given in tiles instead of layout co-ordinates. You can convert between tile positions and layout co-ordinates using the PositionToTileX/Y and TileToPositionX/Y expressions.

Basically the tile you want is the x,y coordinate of that tile divided by the tile size.

Yeah I figured it out. ty