You can send direct messages (DMs) to other players in the app. You do not need to be friends with someone to message them.
From the Friends tab:
Go to the Friends tab
Use the search bar to find the player
Tap the speech bubble icon next to their name to start a conversation
From the Messages tab:
Go to the Messages tab
Tap the new message icon in the top-right corner
Select the player you want to message
Tap Chat to begin the conversation
From the Game Roster:
Open the Game Details page
Scroll to the Roster
Tap the three dots next to a player’s name
Select Send Message
📝 Note: You can message any player on the app, whether or not you’re friends.