well I think, nothing comes from nothing

so here are some questions to check out:

you see the addon in the admin/addon-section?
you read the description of the addon-section?
you followed these explanations?

you entered the new tags in your template?
In which template did you enter the tags?
you uploaded your template anew to your hoster after editing?

if you do not enter the tags in the template you will not see anything..