Click any model in the Assets strip along the bottom to drop it into the scene. Drag the gizmo to move it, or press W, E and R to switch between move, rotate and scale. F frames whatever is selected, Ctrl+D duplicates it and Delete removes it.
Everything you place is a real published asset at real-world scale in metres, so a chair arrives chair-sized and stands on the ground rather than through it. Terrain sculpts and paints the floor underneath, and the day, sunset and night settings relight the whole scene.
Nothing to install and nothing to download: the scene is drawn in your browser from the same models the free 3D models pages serve, and you can export it or take any single model from its own asset page afterwards.
Nothing selected. Click a model in the scene, or a row in the list on the left, and its position, rotation, scale and its own colour and shape knobs appear here.