Help!

A couple weeks ago, I complained because this app changed my fertile days because I was having trouble with my bbt. Just as I suspected, it was wrong and I started my period today, just like my original information predicted. When I went to add a new period, it told me to drag the bars to my cycle length. It wouldn't let me. Now it's saying that I'm on a period today but not for the next two days and then I'll start another period. This app is very messed up. I want the info fixed! Anyone know what I can do?