Clicking "Build" will allow you to build structures, "Trade" will allow a player to trade with other colonies, "Inventory" will allow you to check your inventory. Hit build, choose primary/secondary/external, then choose a location to build, and lastly what type of building you want. Buildings produce resources which are then used to build more and also for endgame score. https://docs.google.com/document/d/1oRHUEnoCWdkmm3njNyzs9kxk5FdjC20vOsJ2H7Q8Ox4/edit?usp=sharing

Open executable file and it will install from there.