When I started with the Phos test I was a little frustrated also, I found a video showing how to use the test. Tap the packet down to one corner, cut two sides with scissors, pull apart and crease one side to pour, seems to work. I found a conversion chart for the reading, printed it and taped it inside the lid of the box also found I need to shake and spin the max amount of time (1.5 min) to get a accurate reading.
Wait until you buy the Calcium test!