It's easy to add anchor links to your emails using Knak's advanced email editor.
What you want to do is add an HTML section above the section you want to anchor:
Then in the HTML block, add this code;
<a name="anchorname"></a><br />
Then you want to go to your anchor link and set the hyperlink:
Keep in mind that anchor links don't work in all email clients. Here is a breakdown on where you can expect them to work:
Goodluck! You can do this!