Allows the admin to show a login form anywhere in WordPress. Simply insert a shortcode in posts, pages, or widgets.
Use shortcode [loginform]. If redirect param is not passed, it will use the current page permalink as a redirect.
Use shortcode [loginform redirect=”http://www.YOURDOMAIN.com/PAGE”]. If a redirect param is set, it will redirect the user to that page. Do note that the page must be on the same URL, it will not redirect to external URLs.
This plugin is available for free at https://wordpress.org/plugins/login-form-anywhere/