Minimum required settings are in the Station, Rig control and the Modem tab.
Press the Setup icon and enter your callsign.(PS: only letters/numbers)
Select your SSID from the drop-down menu.
Then enter your gridsquare. (Two letters uppercae, two digits and then two letters lowercase)
Select input and output audio device
The following settings are optional
Here you can select your waterfall theme, choose between alpha, beta or stable release and also enable/disable pop-up notifications.
Use the "Auto launch browser" settings to enable/disable the GUI when the server is starting. You can always access this from a browser or via the config.ini if you need to change this later.