Change ovulation day?

Rose 🌹 • 18 months down, but finally pregnant with Baby no. 1!
It's only my first cycle, so I could be wrong, but pretty sure I ovulated on Tuesday due to x2 positive OPK's and EWCM. Also had a positive one Wednesday morning but was negative by evening. 
Glow is saying I ovulated Wednesday so my DPO's are all set back by 1 day. It's also saying my period is due 3/18....it's due 3/15. How can I change either or both on the app please?