You have to make the font using the font tool, then paste the image into paint, and save as a BMP or a PNG (PNG is a lot smaller, and still works). Then you load the font into the engine using the setFont function.
but if u are sing win98 u are out of luck :(
win98 type clipboard does not support irr-font-tool
(u can find more on this if u search on my 'name'+font)
i have made my own.