Nicholas has already passed so play resumes with Steve.
Steve activates his Home System and builds his laast 2 Dreanoughts there.
He exhausts the planets "New Albion", "Tequ'Ran", and "Quann" for a total of 5 resources. He adds 5 Trade Goods for the total 10 resources it takes to build 2 Dreadnoughts.
Both Melissa and Nicholas have "passed", so play resumes back with Steve.
That ends the Action Phase for Round 4. The game enters the Status Phase.