If you don't see this list of topics, it is because the standard approach for only showing a gadget on one page does not work for everyone anymore, due to country-code redirections.
I'm looking for a way to fix this. But in the meantime you can see the list of labels by going to the address bar, and pasting in this value:
(What's different? I've added the /ncr code to stop you being redirected to your country-specific version of the blog address.)