Using HtmlElement with HTMLDocument referencing a jEditPane that contains HTML to modify elements?

Question

I am writing a start page for my app in HTML, and I know using jEditPane I can render HTML. I know a little about how to use HTMLEditorKit and how to convert the jEditPane document to an HTMLDocument, but how do I select and change elements on the HTML page? I see there is something called HTMLElement but I don't know how to use it in this context.