How do you add a Motor6D to a part?

I'm trying to make an animation for a non-player object, and I've been told to add a Motor6D weld to connect the parts, but when I select the part, no Motor6D comes up. How do I find a Motor6D and add it to my part?

A solution you could do is make an NPC, except disable it's health and anything relating to GUIs that might pop up. Then you could animate it like a regular player or NPC using the animation plugin.