How do i change my period on eve?

Jocelyn • 26 yrs old, married, Mommy to a beautiful baby girl💕👶🏼 🌈
My period is late and I been trying to put it on <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> but i am having a hard time. I don't know how to do it. Anyone knows how to?