In general, fonts are installed by your operating system and they may then be used by all programs
You might search Microsoft – Official Home Page for help with installing fonts in Windows
In case using fonts are program specific, what program are you using to create your form?
If you have InDesign CC, you can install Japanese version of InDesign with English interface and Ruby(furigana) .
Input Kanji, and furigana in parentheses. 漢(かん)字(じ)
Seleat characters and run the "ルビにするWordコピペ.jsx" script.