The file you downloaded contains 3 graphics:
ExGFXC5 for slot BG1
ExGFXC7 for slot FG3
ExGFXC6 for slot AN2(animation)
Just inserit those graphics in this order in your hack. Click on yelloy then green mushrooms.
Part 2: You noticed that this have 2 map16page.bin folders...one for the FG(map16page.bin and map16pageG.bin), another for BG(map16page.bin).
Do the FG first: put the two bin files into the folder with the rom. Click on the yellow block, find an empty page and press F3...a window will appear. Select the file map16page.bin and you're done. Save and close the window.
For the BG is the same thing: it only change the empty pages you have to choos. Do like this: click on the geen leaf, this will open the Background of the level. Click on the yellow block again and the window will open. Now, double click on a point of the Background...you'll notice that the Pages of the window opened clicking on the yellow block is changed. Scroll down finding a new empty page, and press F3 and search for the map16page.bin of the Bg folder in the download.
yOU MIGHT WANT THE ANIMATION, IS IT?
Then open the sample level, click on the brick block and a window will appear. Click on "COPY ALL SLOTS", then go to the level of your rom, click on the brick block and click "PASTE ALL SLOTS". Now some tiles are animated!
Undersatnded? OK, try it out!