>>2299309To begin with the really basic shit, MMD uses two kind of items.
Models, who use either the .pmd or /pmx expension, and that you can load with the button on the right.
And props (or accessoiry), that you can only load when you have no model selected. Props don't have bones and cannot be moved easily, but the idea is to link them to another model (usually the dummy bone model who's called Dammy Bones because shut up), and then move them around.
The rest is pretty self-explanatory. Once you have a model selected, you can move it around, but remember to register every change.