Featured Images for Posts but not Pages?

There is a “set featured image” option for my posts but not my pages. I want to be able to set featured images for my pages.

I know I have to do something to the loop in the index.php file, because that’s the one that works for static pages?

Below is the code for what I think is the loop part on the index.php page.

Total n00b…what do I do from here?

<?php
					/* Run the loop to output the page.
					 * If you want to overload this in a child theme then include a file
					 * called loop-page.php and that will be used instead.
					 */
					//get_template_part( 'loop', 'page' );
					 wp_reset_query();
						if ( have_posts() ) : while ( have_posts() ) : the_post();
						the_content();
						 endwhile;
						else:
						endif;
					wp_reset_query();
					?>