C targets the nearest station, this could be the faction, the mining or the landing station.
If you find its not targeting station your looking for, go to your map screen, activate the wp if you want to fly there your self or select autopilot and it will fly you there.
Once your there, get close enough and the chat box will appear with the land, repair etc options, or once your within 1000m of the station press / and use the command /comm to activate the chat box.