Hello Johnny....
As Alex has mentioned, visible AI Traffic and Air Traffic Control is only available in default, non-Multiplayer, Solo Flights...;)...!
(That is where you learn Aircraft management and Radio Navigation).
Default Radio ATC is not possible during "On-Line" Flights.
You can only communicate with each other, via the "Chat Window" or via "Teamspeak".
Once the program is up and running, press "Alt" and the menu will appear at the top of the screen.
Select "Flight" and in the drop-down menu select "Multiplayer > Connect", type the Sim V IP Address: 85.10.244.109 into the box which pops up, press "Search", and when successful, press Join, and you are away!
......have a peek here at any time to see who is "On-line"...>>>>
http://cockpit.netfrag.org:8090/Have fun, and remember to apply Multiplayer etiquette with other users on line...

...!
Paul....G-BPLF....FS 2004.... 8-)...!
Note: If you are using a "Router" read the important instructions regarding "Opening Ports" in the Multiplayer Forum!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.