For this installation, you need to have your phone rooted because the fonts you want to install are not included in the most-known Font applications that are available in the Google Play store.
First, you need to copy the font files in a folder on your card or internal storage, then use an application which has system read capabilities like (Root Explorer or Astro File Manager) and copy the files to '/system/fonts'. Perform a restart of your phone and after the phone has successfully booted, navigate to menu > Settings > Display > Fonts and choose the corresponding font.
