Step 1: Format the Text. (Image: Image courtesy Microsoft). Select the date in the slide or double-click the footer to enable the text box before selecting the text. Open the Home tab and use the Font tools to change the font, color and size of the text. You can also add bold, italics or an underline.tep 1: Format the Text. (Image: Image courtesy Microsoft). Select the date in the slide or double-click the footer to enable the text box before selecting the text. Open the Home tab and use the Font tools to change the font, color and size of the text. You can also add bold, italics or an underline.