Once a 3D model has transcoded open Modest3D to start making your 3D interactive scenario.
Click on the Setup node.
Now you are inside the functionality of the setup node. Right click on the model you want to load in the 3D scene and drag it to the setup node.
The 3D model will come up as "ModelName (Created" to show that this has now been added to the scene.
Click "Simulate" and the model will appear in the 3D scene.
Note: See the setup node documentation next. There is lots of useful functionality in setup node.