Select the Text then go to the Home Tab and select the down arrow next to the Font
Color Icon in the Font Group.
Select "White" from the Color Menu that appears.
Step 16: Format Text Box
Next select the Text Box. While holding the mouse directly over the Text Box Outline, Right Click and select
Format Text Box from the menu that appears. This opens the Format Text Box Window.
Step 17: Text Box Transparency/Line
In the
Fill Section, set Transparency to "100%" and in the Line Section you can set Color to "No Color". Then click OK.