you can click LOAD HAND MODEL to load the embedded model to edit gesture.
Then click the bone points on the hand to choose the bone.
Yellow means hover on the bone and blue means select the the bone.
Next, choose Rotate from Operate, the rotate bar will show up.
Edit gesture until what you want.
you can check/uncheck show hand bones checkbox.
Use Export/Import Gesture JSON button to save and reload your work.
