As near as I can tell, your arrival flight (United) will come into "Concourse Z" (Hall Z), which is the upper level, for non-Schengen, of the building housing Concourses A and Z in Terminal 1, and your departure will be from Concourse B of Terminal 1. Of course, the airport could reassign your flights to other gates and Concourses, so ask the flight attendants before you land.
Assuming the gates don't change, you will pass through passport control and go downstairs to Concourse A. Look for signs to "Hall" B. There is a tunnel between Concourses A and B, but the signs might only say "to Hall B" (just don't be surprised if you go through a long pedestrian tunnel between the concourses).