So Here's the scoop.
Buy the sticks where you buy OPKs, and pregnancy tests. The tests will contain an insert that goes over the basics of using the tests, but not all the details on the monitor
If the unit is facing you, the screen is at the top right. The slot is at the bottom left.
On the left side is the on button. On the face is a small button with an M on it to the right of the screen. The M button is what you use to set the monitor.
Now for God knows what reason, this miracle of technology comes with no clock to set, just a timer. So what you do is turn it on, around the time you'd like to test each morning, and hit the m button until you get the current cycle day. This will set your test window which is 6 hours long (3 hours before the time you pressed the M button and 3 hours after). So if you press it at 8:00 AM you can test between 5:00 Am and 11:00 Am.
Each morning you turn it on if you get a flashing stick and an arrow then that indicates your should test. Either pee on a test stick for 3 secs, or dip into pee collected in a cup for 15 secs. Take the cap off the stick, cover the collecting end of the stick. Put the notched end of the stick into the left side of the slot, and snap it into place. If you've done that correctly the arrow will disappear and the stick will start to flash. It takes about 5 minutes to read the test stick, then goes to sleep. I usually pop the test stick out and turn it on, and you get your reading for the day.
One block is low, two blocks is high, three blocks, with the circle is peak. High means your estrogen is going up, peak means it has recognized your LH surge and you will ovulate in 12-36 hours.
I found it easiest if I keep the monitor by my bedside, and keep the test sticks in the bathroom.
The manufacturers claim you cannot get good results with a passed on monitor. They site the risk of infectious disease which I think is dubious, since a) I remember from some survival manual that urine is sterile b) You never touch the part of the monitor that the urine touches.
The possibly valid reason is that the monitor is supposed to learn your cycles, and keep 6 cycles of data in memory indefinitely. I've heard of people who got them used who are quite happy with them, but I supposed it's possible if you are very different from the last user you might have trouble.
You could use it this cycle, by lying about what day it is. Set it tommorrow morning to day 5. It's a risk that it will throw the data off and think you O'd later than you did, but it's an option.
You can PM with questions if you have any.