1. Once you select the event you wish to message with others on, you will click on the Message button.
2. Once you click on the Message button, you will be taken to this screen, where you will click on New Message.
3. From there you can choose to either message individuals, or to create a group message. To create a group message, click on New Group.
4. Name your group, and select the individuals you wish to include in the group.
5. Then, you will be taken to this screen, and can begin exchanging messages!
6. You can also find all of your messages on your Messages home screen.