when to start ovulation tests?

Jen
Hello ladies,
I am currently on my period. ( sorry I don't know all the lingo) and have been trying to get this whole tracking thing down.... my period, when am I ovulating, and I've had a hard time. Well I would like to know how long after my period ends should I start testing using ovulation predictor ? Please let me know ladies and thank you for all of your input! Best of luck to all !