JKing, what you have to do is go to the materialbase, and import the tileset into the tileset folder. Then, you go to the database and click on tilesets, and click "Change Maximum". Then, click on the new one made, and in "Tileset Graphic" choose the newly imported tileset and then set autotiles and passabilities.
It may be easier to download the demo and copy and paste it from there, as the passabilities and all that are already set if you do that.