SECURITY IN MY MEETING

I NEED TO MAKE SURE SOMEONE THAT´S NOT INVITED TO MY MEETING JOINS MY ZOOM. I´M UNABLE TO CHANGE THE SETTING WHERE I CAN APPLY A SECURITY FILTER. WHAT I NEED IS FOR MY GUESTS TO JOIN MY ZOOM WITH THEIR EMAIL, BUT IS NOT LETTING ME MAKE THE CHANGE IN SETTINGS. CAN SOMEONE HELP ME?