First you'll need a NPC Structure from either the Props Trader or if your admin did set it up, from a Custom Trader. Admin could simply cheat it in, have a look at the item cheat list of the Capitalism web platform[capitalism.remolutions.com].


And don't forget to activate Market Access, otherwise you won't see the required MUE option to choose a Trade Actor Type.

Go to the MUE customization options


And open the Trade Actor Type chooser UI



Users have two available options, as long as there is no Dino Garage linked to this NPC Structure.


Selecting the Player Trader option will show a short explanation what a Player Trader is supposed to be.


If you commit your selection you'll see now that the NPC Structure is a registered Player Trader.