Adding Static Images to Fullscreen Theme

Ok,so first of all I am fairy new to WP but have some knowledge of script. But I am not fantastic so there could be a small detail I am missing. But I am using the Fullscreen theme from graphpaperpress.com and am trying to figure out the best method for coding in static images to the home page. I have tried several different methods from several different resources and nothing seems to work (most resulting in broken links). The final product should look something like this This My site is http://www.spectrasnap.com

One method I have tried is adding <img src="<?php echo get_template_directory_uri();?>/images/fpsfabovebeyond.jpg">

However the sizing isn’t right. Any help for this WP newbie would be greatly appreciated.

Thanks!