Graham Mwebvendor have you created the cookie ? you have to uncomment the set cookie line and run the script (just view the page and it does it the cookie is valid for 1 year ) plus you need to be logged in to your xtgem account and the site builder in another tab
it works fine I am using it myself
it does not show anything in the building tool the buttons show on the pages of your site and when clicked they open the building tool at the page or blog post

Actually I just made a small change to the script I realized the buttons would show for any other xtgem user that had the same script (although they would not have worked for the wrong user) I now use the value of the blog_id to check against the cookie