Heres the api page for it.
Ah okay, thank you 
Helped me
Hey,
another problem. I wanna animate another NPC but i canât add the legs to the animator plugin.
Try to select the leg while in the animation editor and rotate it, it will probably show up.
Already tried that, didnât work. But i moved the legs so that the NPC is sitting maybe thatâs the problem? Because when I run it the legs are gone
You canât see it even when you select the leg?
In the editor, I canât selegt the legs. when i go outside of the editor to my workspace then the animator says âYou are tabbed out, tab in to continueâ or something like that
What editor do you use to animate?
The default roblox one, should I use Moon Animator?
No, I was just wondering, try to press the + button and try to add a leg
This:
I did. There are no legs 
When i press Run the legs are gun too, there is a problem but idk which
You may have to get a new rig.
Ok, idk how to do this. I will just get a sitting npc from the toolbox .-.
Look in plugins and go to build rig.
And then? When i move the legs to a sitting position, the same thing will happen again
It didnât work. Legs are still gone
Ok, the legs are there now. But when i run it, they are just falling of the dummy