Run > FONTSeditor/PixelFontEdit.exe To start editing or making your fonts (.pf) for your psp.

How To:
1)Copy a font of your psp (psp mem/seplugins/fonts/xxx.pf).
2)Open yout program,go to >file/open< open your copied file.
3)Edit it or , go to >tools/Clear all< and start making your font.
4)When you finish,go to >file/save<.

Sites which can help you : 
1)http://kofler.dot.at/c64/
2)http://www.min.at/prinz/software/pixelfont/#project