Nearby: 

Messages are visible to nearby players (with message cooldown).

Send Coordinates

Click on the highlighted icon below:

Your current coordinates will appear.

After clicking Send, your coordinates will appear in the channel. Other players can click on it to reach your location.

Random Message

Check out fun random messages there.

PM

In your friend list, left-click on a name and select Private Chat.

Chat in the pop-up chat window.

Click on a player's name in the chat channel to interact, including inviting them to form a party or join an Alliance, viewing their info and adding as friends.