Replace the address in Line 1 in the code above with the address of your label page. You can get the address of your label page by clicking on your label. It goes without saying that this is the label that you will be using to 'show' your gadget. I'll be using the label 'texthide' because I haven't had my coffee and I can't think of anything smart right now.
Also, replace the ID in Line 3 above with the ID of your gadget.
Find for <b:loop values='data:post.labels' var='label'> - paste the following lines directly below it: