Treehouse is a great font style that allows you to give an ornamental, cursive look to your text projects.
To install the Treehouse font simply unzip the archive and put the font file (.ttf, .otf) into /Library/Fonts . Treehouse 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 Treehouse 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.