Custom font files
To use a font that is not installed on your system, select the Custom Font File option on the Font Family parameter. Then, click the ... button to pick a font file from the file system.
Using fonts in Packages
When creating packages, system-installed fonts are not copied automatically into packages: they rely on the font being available on the user's machine. If you want your text effect package to work even when the font is not available on the user's machine, you must use Custom Font Files: this way, Autograph will copy and distribute your custom font file with the package.