ROES has fonts included that are selectable for text on many different products and templates. However, if these specific fonts are not installed on your computer, then they will not display properly in the product preview.
Click here to view the fonts built into ROES.
They can be downloaded from the following sites, some of them for free:
http://www.fonts.com/
http://www.fonts101.com/
http://www.fontface.com/