I want to move phpmyvisites from one directory to another ; for example from site.com/subdir/dir to site.com/dir. What should I do?

You have to move the directory to the final location. If you don't have SSH access to your server, it means that you have to download the directory from the server to your computer, then upload it to the final location (site.com/dir). Please check that all the files have been uploaded.

You also have to change the path in the config file of phpmyvisites in /config/config.php (look for the phpmv_url value). Put the new value (http://site.com/dir without the trailing slash).

Finally, you have to edit the javascript code on your pages, and update the phpmyvisites.php path.

All the steps are very important.