This app is confusing

Hannah

I seriously can't figure out how to add my period. I click where it says add period, and I seriously can't figure out where to add it. I really am only here for the forums, but even that is confusing, they seem to just randomly put stuff as the main screen, and I can't always find my groups, etc. Am I just an idiot? Do others find this app confusing? I use ovia and ff, and neither of those are nearly as confusing to me