Click . A line will appear on the top and bottom of the page with multiple "move points" .
Move the cursor between two move points until a double arrow appears . Hold down the left mouse button and drag the line to the top or bottom where the user sees the biggest curve on the page.
Position the curve along the text on the page. Move the cursor over the "move points." When a four arrow cursor appears , create an underline to the curve by dragging the points to the bottom of the line along the curve of the book.
Right clicking on a "move point" will delete it.
Right clicking on an empty area on the line will add a "move point."