Tazmantravel

What about sending the a single message to the entire group? I understand how to add all the guests to the chat feature. I understand how to send a text to one of the guests in my contact list. Now, I want to send a text to all 40 guests in our group. How do you set up a group chat session so all guests get the one text? Is there a video showing how to do this that anyone is aware of? I’ve been searching and have not found one yet.