How do I change tile on collision? Set location to tile?

When using the tiled background object, the tile map is split up by numbered tiles. If I use tile 1 for grass but want to set it to a dirt tile in position 2 on collision, or set spawned objects to "tile 1" locations, how would I go about doing that?

I looked through the tiled object properties and it didn't look like I could do much other than set the tile to flipped or something.

Please let me know if I need to be more clear.. It sounds so simple but I'm not able to figure it out.

There are two tilemap expressions TileToPosition and PositionToTile with that you should do what you want. For example change Tile on a positionXY:

Sprite| Is overlapping Tilemap -> Tilemap| set Tile(Tilemap.PositionToTileX(Sprite.X),Tilemap.PositionToTileY(Sprite.Y) to tile 1

Create object on a tile number 10 in x and tile number 10 in y.

event -> System| Create object Sprite (Tilemap.TileToPositionX(10),Tilemap.TileToPositionY(10))

https://www.scirra.com/manual/172/tilemap