In case you missed it, here is a step by step guide from the video:
  1. Change between upper and lowercase letters by pressing the caps lock button to the left of the space bar.
  2. Press the font button at the top left next to the power button.
  3. Use the up and down buttons to select the font, size, width and style options.
  4. Use the left and right buttons to change the highlighted option.
  5. Press the OK button to confirm changes.
  6. Preview the label by pressing the preview button at the top next to the font button.