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.
Hi Leandro,
What version are you using? On the Insert tab, you should see 3D Models in the Illustration section. You shouldn't need to add it as a custom button.
On a new install, you probably don't have any 3D files, so choose the Online option.
Let us know.
Thanks