Put these three files in a folder, then put that folder in a named folder in dynos/packs, so for example i want to export a peach model, i will click export, and name the folder with geo.inc.c + etc "Assets" and put that folder in dynos/packs in a folder named "Peach" then start the game.
Then you start the game then your model will generated by the game using those three files and now you can check it in the dynos menu.