It's possible to have a blog with multiple authors. By default each post is authored by the site owner/creator.
But if you're writing a blog with other people you can use `author` metadata property. If such property is specified you, name of the author would show up on the page like on the screenshot below.
Author name would be a link to the author's page.
You can create an author page by adding "authors" folder inside your site's folder. In that folder create one note per author. Eg for the example from above there is corresponding note called "Anton":
If your post has multiple authors just enumerate them inside "author" property and separate them with ",", like this: