To move an expression using the mouse:

Select the expression you want to move.

Drag it to the new location.

Release the left mouse button when the cursor appears where you want to place the expression.

To copy an expression using the mouse:

Select the expression you want to copy.

Hold down the Ctrl key and drag the expression. The cursor displays a plus sign (+) to confirm that your selection will be copied instead of moved.

Release the left mouse button and Ctrl key when the cursor appears where you want to place the expression.