How To: add a font to BytaFont

To add the downloaded font to your BytaFont library you have to follow these steps:

unzip the archive
connect to your iPhone
copy the folder <font name>.font to /var/mobile/Library/MyFonts (MyFonts folder is created when you install a font from Cydia – Fonts section, otherwise you can create it manually)
run BytaFont and change the fonts according to your preferences (see BytaFont overview)