Hi gryshnak,
Go into 'Connection' to bring up the 'connect to server' window' as shown below.
You can see in the 'connect to server' window my settings for connecting to the SimV TS server.
To add a new server you have to 'right click' on the 'connect to server' window, this will give you the option to set your server or IP address. When this pic was taken I was the only person on the server (shown by the green circle next to my name). You have to move (double click on) to the same 'room' as somebody else in order to talk to them, most people use the 'Flight Deck'.

You can still set up your microphone & speakers the way you want by going to 'Settings' -> 'Sound Input/Output Settings' & activating the 'Local Test Mode' (This means only YOU will hear what you say).
Hope this helps,
TSC.