Simply, to upload and use your custom font please follow these steps:
From Dashboard > Appearance > NasaTheme Options > Fonts >Set Type font to "Custom Font"
You can create with this format:
folder: name => your_custom_font_name in folder => create file: your_custom_font_name.css and all files fonts (ttf, eot, woff, ...)
in file: your_custom_font_name.css => call link to fonts file:
This is ex about fonts of us get at here
Documentation guide on how to configure your text font here