Change Instructing courses slug.

Please add this code in your wplms-customizer.php file present in your wplms customizer plugin.

add_filter('wplms_instructing_courses_endpoint','custom_slug_for_instructing_courses',9);
function custom_slug_for_instructing_courses(){
  return 'custom_link';
}

Please change the custom_link accordingly.

Please do not forget to re-save permalinks after applying this code (it requires permalink structure to be re-saved).