A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
What George Jiang described is for applying 3D effects to regular 2D Shapes. I'm not sure that's what you're looking for.
The 3D Models are not included in the Shapes tool. There is a separate tool for 3D Models in that same group. It provides a choice of selecting locally stored 3D images or accessing the Online library of stock 3D Models.
Is your subscription a personal subscription or is it provided by an employer or institution? If you do not have that tool it may be due to restrictions set by the administrator of the software.