You usually do team chat in Roblox by typing /t or /team before your message, then pressing Enter; that sends it only to teammates in games that support Roblox’s built-in team chat.

In Fallen Survival

  • Open the chat box.
  • Type /t your message or /team your message.
  • Press Enter.
  • If it works in that experience, your message should only go to your team.

If it does not work

  • Some Roblox games disable or override team chat.
  • Try typing /t hello first, since that’s the simplest test.
  • If the game uses its own chat system, you may need a team button, channel, or a specific menu instead of the normal slash command.

Quick note

A Roblox wiki page says team chat must start with the command at the very beginning of the message, with no extra space before it, or it may go to public chat instead.

TL;DR: In most Roblox games, including possibly Fallen Survival, use /t or /team to chat with your team.