Each Contributor record allows for a link to the Contributor's bio page.
If that information is appearing on that Contributor's bio page, it will not display that link, since it would be a link to the page the viewer is on.
Bio page links are added to a Contributor by navigating to the contributor record via the Hamburger Menu > Manage Contributors > [Select Contributor]
The Bio Link added to the this field will display with the text Bio wherever it appears.
But on the Bio page itself, it doesn't appear.