I think the title explains what I'm trying to do: I'd like to use the Parisienne font with widget titles but I can't do it. Is there a way or Atahualpa can't use this font? Thank you!

For that you will have to use TypeKit or Google Fonts, or @fontface etc. For a font to be seen on a computer screen the user has to have access to it so it either has to be installed on their computer or retrieved from services like I mentioned. Parisienne is available at Google Fonts and that is the service I prefer to use. You just put the font code in HTML Inserts: Header and then use the font family wherever you like.

Perfect! Thank you