Go to https://www.genarate.com and log in.
You can either choose to work with an existing project or set up a new one. Within the project you can decide whether to create a new WonderPage or use an existing one.
After you have defined a target image please click on the “3D Model” icon in the toolbar on the left and then browse for the 3D Model you want to place in the Designer panel (possible formats: fbx, gltf, glb).
The 3D object shows up on top of the target image. In the settings panel on the right your can modify various settings like size, rotation, auto play, etc.