All teams have a chat where you can communicate with the other members of your team! To chat, simply tap the "chat" button, write your message, and then hit done. Your message will be visible to everyone else in your team, so please use the chat responsibly!
If someone in your chat is being disruptive or inappropriate, you can block their messages. Either tap a message from that player in the chat, or tap their name in the team member list, and then select "block". This will hide all messages from that player. If you block someone by accident, you can unblock them by finding their name from the team member list, and then tapping "unblock".
You can also report another player for inappropriate behavior. Simply tap the inappropriate chat message, and then tap "report".