Menu: Edit→Move Parameter
To move parameters around, first press this button. Then point to an object that has a parameter that you want to move. For example, point to a single-headed arrow if you want to move the regression weight that is associated with it. Then press the left mouse button and move the mouse.
If you move a parameter associated with a selected object, parameters associated with other selected objects of the same kind will move too. For example, if you move a selected regression weight, any other selected regression weights also moves.