Delicacy active theme folder

Hi! I’m still really liking your theme but was wondering if you could help me. I have YARRP installed but no images are showing for the related posts, only the post titles. The creator of YARRP has advised me that I need to copy and paste the YARRP template into the theme folder. I have found the YARRP template but cannot figure out how to put this into the theme folder. I cannot find a theme folder. Can you help me?