how is mouth working, there are only one shapekey in mask_mouth,or can you make a video how mouth working?
By default there is only one shapekey which is the one used for the "wide mouths". You must add more shapekeys depending on the expression you want.
How to add? I try to move all bound on mouth but nothing change. Should i remove some the polygons?
By default the mouth is disabled, you must check the property "Mouth" in the Pivot_Mouth bone. This option is in the panel that appears when pressing the N key.I'm not sure if this is what you mean.
I have tried to change the sharpkey but it's not working
How do I make my mouth do other shapes, I want to do a little bit of lip syncing
You must add more shapekeys in the object mask_mouth.Remember to leave the shape flat by editing in local axis mode and not touching the Z local axis, otherwise the mouth will glitch (limitations)