Coordination is not a simple task and there are many options that can change the behaviour of the program to get it to work the way you want. For more on that see the relevant sections.
There are some elements that require setting up before anything can be done. The following is a list with a link to the pages explaining what they are and how to use them.
The basics of setting up the station require at least one terminal. The basics of a terminal require the default setting for a flight type. There is a lot more to it, but for an Airport where International flight go to Terminal 1 and Domestics to Terminal 2 its fairly simple.
Follow the following links to the relevant sections.
How to use the setup screens