If you only want the author tag to appear on the blog posts and removed from all other pages such as home page, contact us etc... Then here is a quick fix.
(1). Open class-frontend.php (wordpress-seo/frontend)
(2). Search for: "public function author() {"
(3). Around Line 757
(4). Replace "is_singular()" to "is_single()" (without quotes)
Now your author link will only appear on individual blog posts rather than on every page on your site.