Add a separator by moving the "Rating" instrument to the desired position in the e-mail body.
A form will appear. Fill in the name for the best rating label and the worst rating label.
Click on "Appearance". You can choose between standart fonts or google web fonts. Select a font family and set the font size and font weight. Set spacing and choose a color for the text.
When everything is set, click on the "Confirm" button.
The rating will be displayed.