- 
        From the Traces section of the action bar, tap Direct Modification
           . .Options are available in the 
  Graphic Properties
  frame at the right of the screen. 
 
- 
        
          Move the cursor towards the curve that you want to modify.
        
        The point which is closest to the cursor is activated.
            
- 
        
          Drag the selected point to change the shape of the curve.
        
        
      The vector curve is modified.  
- 
        
          Repeat steps 3 and 4 as desired.
        
        
      
Note:
			You can freeze the selection by tapping the curve and unfreeze it either by tapping another curve or by tapping anywhere on the screen.