I can't answer the questions about your specific product - maybe the insert is helpful? I have to keep re-reading the insert for my sticks to see exactly how far in advance they predict.
DPO is days past ovulation. CD is chart day. You use CD for days before ovulation and DPO for after. Check out fertilityfriend.com - it makes sense when you see the abbreviations on a chart.
Tarheels gave you good answers. Consult the Google or the insert that came with your fertility thingy. The monitor should also tell you how many DPO you are, and help you narrow down your window for testing.