There are generally two ways to just show one link:
- Create a link category and just add that single link to it. Then use the shortcode [links category_name=”your category name”] to display the link.
- Or: lookup the ID of your link. Then use the shortcode [links category_name=”a non-existing category” include=”12345”], where 12345 is the id of the link to show. In this case the non existing category will ensure that no links are returned and the include attribute will ensure that apart from the empty list this specific link is included even if it does not belong to the specified category. This is probably easier to maintain than adding categories for each unique link you want to show.
You can find the ID of a link by clicking on a link in the Links manager. The URL of the page to edit the properties of the link will include the ID in the form of link_id=xx.