How do I add authors to my FB page

I run a blog that has around 50 authors writing articles, how do I get it so when I post on the blog Facebook page so I can tag an author such as in this example?

http://imgur.com/a/jqG3J

You will see from the picture that the author Mel Ramsay is clickable, clicking their name takes me to her Facebook Page or profile (dependant on what they've set it as)?

I need to replicate this for my blog but Facebook help is useless.