Simply put, I don't know how to position a horizontal rule. I desperately tried div position, but that didn't work. How do you do it?

Use CSS.

e.g.
<hr style="margin:20px;" />

That would add some spacing around your horizontal line. If you want to make the code effect all <hr /> tags then you should move the style into a stylesheet :)

Ah, okay. I think I can manage that. Thank you! :)

If you mean positioning on a page layout, you could put it in a table.