I've just downloaded Gimp and am trying to figure out how to change the brush dynamics so that the brush thickness changes relative to the pressure I apply to the stylus. There seems to be a way to do this by using 'Basic Simple' dynamics, but I am unable to change any of the settings listed here. I read another post saying that I could have to duplicate the brush to be able to change those settings, but I cannot figure out any way to do that.
How can I make the width of my brush pressure sensitive?