Hi Kaete — you can move the files using your favorite FTP client. Just log into the server/site and move from all of the files in the source folde (wp-content/plugins/yet-another-related-posts-plugin/yarpp-templates/) to target folder (/home/kaetemar/theessentialebooker.com/wp-content/themes/thesis_18 directory). Once you do that, make sure that “automatic display” option is turned on in YARPP preferences.
Let me know if that doesn’t fix the problem.
Tomer
PS Once I discovered that I was getting data in the RSS feed, I was able to add the YARPP posts by embedding code into the custom_functions.php file. Hopefully you won’t have to do that but I can walk to through it if you do.