Gizmos

• Starting at the top, the three colored arrows are for the end point of the Curve click and drag to change the ending position.
  
• The circle at the top is to control the twist of the profile click and drag it to change the twist amount.
  
• The blue line with a box at the end on the side of the object is to change the outer radius scale click and drag to expand or contract the radius.
  
• Circle at the bottom of the object is to control the radial resolution and the yellow line with a box at the end is to control the vertical resolution.
  
  

Modifier options

Most of the modifier options are self explanatory but there's a few things you may want to know.

• Flip Curve will do nothing if the curve is symmetrical
  
• If you're using the second profile, make sure it's enabled and set to a different value than the first profile. Otherwise, it may seem like it's not working
• Changing the twist option when the profile is a circle will appear not to work, As a circle is rotationally identical.