When you are playing a game of Agma.io, you can right click on any player and an option pops up to add them as a Friend. You can only add them as a friend if the are registered and logged into their account. The Friend List is located at the top right corner of your screen and when clicked, shows you all your friends, and if they are online. If they are online a green dot will appear next to their name and the name of the the server they are currently in, will show up next to their name. Clicking on their name allows you to send a private message directly to them, and a flashing red bar will appear above their chat bar in game, allowing them to see your message. However, these things are only allowed when you add them as a friend and they add you back, otherwise it will just say "(Pending Acceptance)" and you will not be allowed to use the features listed above.