Changing due date on app?

Leah,👧🏼👧🏼👶🏻💙due12/28/21💕 • I’m 32, from MA, have 2 daughters 13 & 15 & 2 step-daughters, also 13 & 15 👧🏼👧🏼👧🏼👧🏼!! Son due Dec 28 👶🏻💙!! Engaged to my best friend. ❤️

I cannot figure out how to do this seemingly very simple task. Can anyone fill me in? 🤦🏻‍♀️ my OB changed my DD from 12-12 to 12-28.

Ty!!