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 to above the section you want to anchor:
Then in the HTML block, delete all the code that is in there and 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!