How do I adjust my cycle?

Aru
My last period continued for a couple of days longer and now my <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> is out of whack. I adjusted the pink dots on the calendar, but it doesn't seem to be working. How do I set it right? For example, it tells me that my next period is in 1 day, meanwhile I am supposed to be ovulating.