Custom Post Type Thumbnails

Hello,

We have used the https://ignitiondeck.com plugin, and we have created a custom page to display all the projects, however, we want to add thumbnails/featured image display to the project page, how could we do that?

Also, when adding a project, it does not have the Featured Image Option on the admin sidebar, how could we add it?

Here is the custom Page we have:

<?php
/*
Template Name: Projects
*/
?>
<?php get_header(); ?>

                    <?php $loop = new WP_Query( array( 'post_type' => 'projects', 'posts_per_page' => 10 ) ); ?>

					<?php while ( $loop->have_posts() ) : $loop->the_post(); ?>
                                <div class="invest_thumb">
                                    <?php
										if ( has_post_thumbnail() ) { ?>
											<a href="<?php the_permalink() ?>"><?php the_post_thumbnail(); ?></a>
										<?php } else { ?>
											<a href="<?php the_permalink() ?>"><img src="<?php bloginfo('template_directory') ;?>/i/post-no-img.png" alt=" "/></a>
										<?php }
									?>
                                </div>
                                <div class="investment_info">
                                    <h2><?php the_title() ?></h2>
                                    <?php the_content(); ?>
                                </div>
                    <?php endwhile; ?>

<?php get_footer(); ?>

Anticipating for a good idea on how to do this features.

Thanks