1 To try you first have to click on that on/off button on the right bottom side of your screen to put it on. If it is red it is not on. If it is activated you should see three grey buttons appear.
2 Then by clicking the right grey bar with green light it opens a chatroom and you should see who is online to chat too.
3 If you want to chat with a particular person there is a search bar you can type their name in, they have to be in the online list though. Or you can just click their name probably
4 Else you just go to General chat (the center grey button) and type there.
5 Typing is done in the lower blanc bar and by hitting enter it will be posted in the General chat room.
6 If you see someone on the right window who is not yet in the general chat you can try and drag them to the general chat window to send them an invitation.
7 You can also start your own chat bly clicking on the most left grey bar and give it a title. You have to pick if it is public or only for you and can invite people the same way as in the general chat.
8 If you want to close the chat feature, in the right grey bar when it is openend you have to click on the little down arrow next to the sun/settings image.
9 If you accedentially closed chat windows and wonder where they went you find a grey button on the left bottom side of your screen that says More Chats with an up arrow next to it. Click it and you will find all the chats that are open to you at that moment.