Please do the following steps, navigate to your Font Manager and defined all the font-family (and font-weight) that you're going to need throughout the site, that is font-family for body copy, headlines, navbar, logo.
Then navigate to Theme Options > Typography and enable the FONT MANAGER.
Then set the BODY FONT and HEADINGS FONT under Theme Options > Typography, you should see all the font-family that you defined on the Font Manager in the dropdown (not the list of all fonts).
Then LOGO FONT and NAVBAR FONT is under Theme Options > Header.
Remember to clear your caching plugin after you made the changes.
Hope it helps,