You can use NJStar WP as a text-editor to edit HTML souce code. We recommend you to use Shift-JIS file format for for Japanese web page. Just type the tags and text directly and save it. Here are a few pieces of advice:

• Make sure not to type HTML tags with DOUBLE-BYTE characters option on.
   
• It is much quicker if you prepare the template (i.e. format of the HTML file already defined) with a proper HTML editor first, then use NJStar to add Japanese (or Chinese) characters.