Click Manage fonts to specify a new font in Theme Management. You can use so-called universal system fonts, Google or Adobe font services or web font files downloaded to the system as the source. If you are using separate web font files, add the font file separately for all three required cuts. Click the selection buttons and select the files one by one from your device.
Enter a name of your choosing for the new font definition and click Save.
If you want to add more fonts, click Add new font. In the future, you can use the added font in all themes.