There are many ways to install the fonts. With a larger set of fonts you could use font management software like FontExplorer or Font Agent Pro. Both are available for both Mac and PC.

Mac OS X

A. Just drag the fonts into "Macintosh HD/Library/Fonts" to install.

B. If you want to make the fonts only available to your own user account drag them to "your_username/Library/Fonts"

C. Use Apple's FontBook.

D. If you working in a Adobe software, drag them to "Library/Appplication Spport/Adobe/Fonts" to be able to use them diretcly.

Windows Vista/Windows XP/2000

Go to “Start” > “Control Panel” > “Fonts”. Click on “File” > “Install new fonts”, then find the fonts and click “OK” to install.