Go to Menu > Preferences and select Raspberry Pi Configuration
A window will open where you can personalize your system.
If you need to set your system localisation, click on the Localisation tab and then on Set Locale (language), Set Timezone, Set Keyboard and Set WiFi Country buttons.
Signal K server provides many useful tools and you will have to visit its administration panel often. Go to Menu > OpenPlotter > Signal K.
Data visualization is open but settings is under authentication. Press Login button upper right.
User name: openplotter Password: openplotter
If you are going to share data with other boats you should have an unique identifier. Login to Signal K and go to Server > Vessel data and change at least your boat name and MMSI.
Here you can also provide data about your boat that could be useful for some Signal K tools.