You can add or edit raster fonts using the Edit AFP Font dialog:

Note: You have to specify the correct code page and character set of the font, otherwise you may not get the expected results when rendering or printing.
Note: Usually, you should have 4 font files for all variants for each font family: regular, bold, italic, and bold italic.
Note: For raster fonts, you need to specify the size in points at which you are using the font.
Note: You need to restart the service for changes to take effect. You can do that by checking Restart the service to apply changes when modifying a value.