I know, but now I need some "token" also for the market and I don't have a clue how to get it. Good Lord...
You'll need a 'Trade Token' to use the market. Obviously, you can't buy them right now (because you need at least one for each trade) so you can try to find them on the world map around you.
Look for a two-arrow symbol like this
⇄ and send drones to that location.