Remix it and make something with the engine! scroll down and find the 'frame' and 'scene' custom blocks, and in scene, either put the block of code nearby to render the mesh that is loaded (currently blender suzzanne) or drag in spheres or triangles from the pallete. In the 'frame' custom block, put things you want to run once a frame. The timer will report delta time.
MESHES ARE SLOW! MAX 500 TRIANGLES IF YOU WANT IT TO RUN AT A REASONABLE SPEED! I would recommend <50 triangles for games. To import a mesh, show the obj file list, then use the import function to import a .obj file it into the list. Then run the script in the stage to load it. Afterwards, you may want to delete the contents of the vertex and obj mesh lists.