1. Close all open applications before installing fonts.
2. In the Finder, open the folder or disk that contains the fonts you want to install. Make sure that they are unzipped.
3. Select the all font files for the fonts you want to install (remember that each PostScript font requires 2 files), then double-click on any selected file. Font Book, the Mac OS font manager, will open a preview window for each font.
4a. Drag each font to the Computer icon in the Collections pane if you want the font to be available to all user accounts on the computer.
4b. Drag each font to the appropriate User icon if you want the font to be available exclusively to that particular user.
4c. Alternatively, you can click the Install Font button to install the font to the default location specified in Font Book > Preferences.
Fonts located in /UserName/Library/Fonts are available to a particular user, but not to any other users with separate logins for the same machine.
Fonts located in /Library/Fonts are available to all local users of the machine.
Fonts installed in /Library/Application Support/Adobe/Fonts (during installation of an Adobe application) are only available to Adobe applications. To make them available to other applications, move them to /Library/Fonts or /UserName/Library/Fonts.
If you want fonts to be available to applications running in Classic mode, (available only on older systems) you must install fonts into the Fonts folder inside the System 9 folder. They will be available to both your Classic System 9 applications and your OS X applications.