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Once you've enabled Japanese input on your computer, you can use the language bar (Windows) or keyboard menu (Macintosh) to Japanese. When you start typing now, all of your words will be underlined with a dashed line. Use the standard Hepburn system romanizations to input words.

e.g. Type: n i h o n => にほん

If you want the word to appear in hiragana, then hit the enter key to accept the displayed characters and the dashed line will disappear.

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There are some characters that don't have one standard romanization or whose romanizations don't work with the accepted input. Here are some of the quick ways of typing some of those funny characters. 

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