Template:Metacritic television displays an external link to a web page for a television series or made for television movie at the Metacritic website. It is intended for use in the external links section of an article.
Click on the correct link to go to the TV show's page (or whatever you're looking for). Be sure you're on the correct title page.
The page URL for a television series or made-for-TV film should look like https://www.metacritic.com/tv/YYYYYYYYYY/, with the YYYYYYYYYY being a text ID for the film/series (and usually the film/series title with all spaces and punctuation replaced with hyphens).
where "YYYYYYYYYY" is the id you've copied, and "Title" is the title of the movie or show. The title field is completely optional, and will default to the Wikipedia article title if left out.