DK Samhain is a beautiful font style that allows you to quickly give an eroded, creepy, Halloween look to any text string.
To install the DK Samhain font simply unzip the archive and put the font file (.ttf, .otf) into /Library/Fonts . The DK Samhain font integrates quickly into your system and you can easily access the custom glyphs though any text editing application.
Mac OS X comes with pre installed font styles and DK Samhain will simply be added to your pre existent library. The process is managed through the Font Book application, where you can easily browse and preview your currently installed fonts.
To learn more about dealing with the Font Book application you can easily access the Apple support page HERE.
NOTE: The DK Samhain font is free for personal use only.