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How do I use the "HTML Special Characters" admin widget to insert special characters into other post fields (such as the post title)?

You can't. The plugin only inserts the HTML character encodings into the post body. However, you can certainly hover over the character you want to use to see the HTML encoding for it (it'll start with an ampersand, &, and end with a semi-color, ;) and type that into the field.

I've activated the plugin and don't see the "HTML Special Characters" admin widget when I go to write a post; where is it?

It is in the sidebar, most likely at the sidebar's bottom.

Have any references?

Try:

• http://www.w3schools.com/tags/ref_entities.asp
• http://tlt.psu.edu/suggestions/international/web/codehtml.html
• http://wdvl.internet.com/Authoring/HTML/Entities/