haha we jsut learned how to use ours too....you do what the instructions say...generally, add one drop, cap the tube, shake. Repeat after each drop until the water changes from blue to yellow. When that happens, you should be a chart that tells you the degrees and ppm. It should have a chart but in case it doesn't I'll re iterate ours here.
0-3 degrees (0-50 ppm) - Discus, Arowana, Elephantnose, Neons, Cardinals, Live plants
3-6 degrees (50-100 ppm) - Most tropical fish including angel fish, cichlids, tetras, botia and live plants
6-11 degrees (100-200 ppm) - Most tropical fish including swordtails, guppies, mollies and goldfish
8-12 degrees (140-200 ppm) - Marine fish and invertebrates
11-22 degrees (200-400 ppm) - Rift Lake Cichlids, goldfish, brackish water fish
Ours has ranged from 9-12 and the guy at the lfs said that that was great. I hope this helps.