I need to define a mouth on this fish. I will not need a functioning mouth. I just want to make him swim about. I checked a few tutorials on YouTube that implied that the Crease Tool, or the Bevel tool might work...but not for me. When I tried the Crease Tool, the selected edges got thicker, but didn't affect the geometry. The Bevel Tool seems to scramble the edges. Again...not effect on geometry. How should I proceed?