All that you need to do is place and Anchor Tag at the top of the page and then have your link at the bottom of the page refer to it.
Now, DotNetNuke places anchor tags at various places on a page. I think that there is an anchor at the beginning of every module on the page. You can add others using the HTML module, or by placing them in the Header or Footer of other modules.
Examine the page source for your page and look for "a" tags like:
That defines an anchor.
Next, for your link at the bottom of the page, construct the link like this:
<a href="#364">Table of Contents</a>