You
            can move vertices and tangents using the Move and Scale options
            of the Edit Mode box:
         
         
            - To move a vertex or tangent in any direction,
               select Move. Click the vertex or tangent and drag.
               
TipIf you have trouble
                     selecting a tangent handle that is very close to the vertex, hold Q then select it.
                  
                
             
            - To move selected vertices in any direction,
               select Move. Click one of the selected vertices and drag.
            
 
            - To move one or more selected vertices
               in the direction perpendicular to their tangents, select Scale.
               Click one of the selected vertices and drag.
            
 
            - To ensure better continuity on a garbage
               mask, automatically adjust tangents as you move vertices or scale
               the mask. Press and hold G and
               then drag a vertex. See 
                        Automatically Adjusting Tangent Handles of Adjacent Vertices.