Mac recognizes TrueType and OpenType fonts (.ttf and .otf), but not the PC bitmap fonts (.fon). Files are compressed, you may need an utility like Stuffit Expander.
Fonts are placed in your operating system’s Fonts folder and will be made available to all the applications or programs you use.
On Mac copy the font files (.otf, Mac Truetype, Mac Postscript) into /Library/Fonts.
Now open the application and the font should be in the select type/font box.
1) Under Mac OS X 10.3 or above (including the FontBook): Double-click the font file > “Install font” button at the bottom of the preview
2) Under any version of Mac OS X: Put the files into /Library/Fonts (for all users), or into /Users/Your_username/Library/Fonts (for you only)
3) Under Mac OS 9 or earlier: The old Mac fonts are not supported anymore, so first, you have to convert the font files (.ttf or .otf) you have downloaded. Then drag the fonts suitcases into the System folder. The system will propose you to add them to the Fonts folder.