1. Download the objects and put the material, mesh and image files in My_Objects.
2. Go to tools and object maker in game and create a new group if you dont have one. Example Username Default. Then save it.
3. Click on "Mesh" and type the mesh's name in the box Mesh: box. Example theobjectsname.mesh. Then click Add New
Also, if you want your object to not be walk able click on the Own Collision. If it's red the object is walk able, if its green its not walk able.
4. Then click back to Object, type what name you want on the object, and the group name on the group there you want to save the mesh in. Then click on Save and the objects name should appear in the group you saved it in.
5. Then export your objectt, it asks if you want to overwrite, click OK and wait while it exporting.
Done ^^