Copy the raw text from the get_moving_bookmarklet.min.js file. Open the Bookmark Manager in your web browser. Add a new bookmark and paste the minified javascript into the url field.
Go to the Fitbit website and log in. Once logged in, click your newly created bookmark and a table should show up at the top of the page. While the bookmarklet will work from any page on Fitbit's site, I've found that it looks best when launched from the Food Log page.