Header Slider in Smartline

Smartline theme seems to have slider feature.

http://themezee.com/docs/smartline-documentation/#slider

Well, I can’t test this theme, since it is not a free theme.

However, you can add featured image to page by adding the following code to functions.php.
Pls note, it is suggested to use child theme for editting theme.

add_theme_support( 'post-thumbnails', array( 'post', 'page' ) );

For adding tag support for pages, see this article.

http://www.sitepoint.com/wordpress-pages-use-tags/