To log ovulation manually, tap ‘+’ - More parameters > Ovulation > Add it > Save. After that, you’ll be able to log ovulation (Ovulation: My method) along with other symptoms.
The Ovulation: my method option can be used for all methods that help detect ovulation except ovulation tests and BBT. That could be an ultrasound, your symptoms (ovulation pain), pills that stimulate ovulation, tracking cervical position and texture, etc. By tapping this option, you let Flo know that you’re ovulating today.