1.  Go to Operate the Store > Categories
   

   
   
   

2.  In the category tree on the left, click and hold the left mouse button on the category you want to move 
   
   
   
   
3.  Holding the left mouse button, move the category to where you want it to be positioned and release the left mouse button.
    
    
   
    
   
   
   Note: Changes made here take effect immediately. You can change the order of categories in the store by moving categories among others.