How do you message other players

In the stock standard game of Rust how do you send a message to another player privately? Is there something that needs to be enabled on the server?

Thanks

You cant, theres only 1 chat and its public (vanillas). Just add him in steam or voice chat

You cannot with just the game; it’s game chat, local voice chat, or steam chat.

Thank you. So why do all these server lists have hings like /message or /pm?

Those are mods.

Thank you.

Depends if the server has a PM system in place or direct chat

Its a mod thing and thats that, The thread has been answered. The stock standard game does not have a PM system built into it.