I use a monitor so I use the peak , either one is fine in the Opks use positive and it will still adjust it for you
There's only positive or negative in opk
The ovulation box is in events you have to scroll down pretty far once you get there click on Opks which is for you to add one or choose when you ovulated. You can click on it even if you aren't using it and you know u ovulated click peak day and hit save or done and it will update your calendar
When you go to your calendar click on the day that you ovulated and you see there all those things you can add to that day, scrool all the way down to were you see you can add intercourse, an hpt and ovulation. Once you click ovulation you will get a box to ask yes or no, choose yes and then at the top right hand hit save or done and it will update it's self to the day u selected