The module developer should have written a INSTALL.txt file where it should specify if he meant example.com/.htaccess or example.com/modules/themodule/.htaccess so I'm not sure but i think he wants you to modify the main .htaccess locate at the top of your site installation.
.:: I met php the 03 December 2003 :: Unforgettable day! ::.
Server specs (Server OS / Apache / MySQL / PHP / DragonflyCMS):
CloudLinux / Apache 2.4 LSAPI / MySQLi 5.7 / PHP 7.3 / head