This confused me too. Completely forget about the "Goal: Not SetUp" writing and look above that -- the box on the left is for your "now" reading and the box to the right of that is for your "target" reading. If you have a current FC reading of 2, put that in the left box. Go to the Chlorine/CYA chart to see what your target reading is -- if you want to get to 5 FC, put a "5" in the box on the right, under "target." Hope that helps. I'll be online for a little bit if you need more help -- I haven't figured out all of the calculator yet, but that part finally clicked.