Just Place it where you want it. then attatch it to the Bone closest to the area you placed it/affects the are you placed it. then that should be it. if you want the animation it should be there as well. can always askin the vrc discord for help : )
Went through all the pages from today 12.06.2020 Yuss every single fucking page xd and this is what the last one was... took me 1 hr ish to do and i got some models aswell if you see this Please apprecheate my efforts xd.