When you are on the Generate New Map page, link your tileset images to the map. For your map, you look in your database under tilesets. On the right of the pane, you will see a list of images like A1, A2, A3, A4, A5, B, C, D, and E. You will insert each image based on that tileset to match it. A1 => A1, A2 => A2, etc.