To change your birth info in the app, just go to the top right menu > account settings > EDIT and you can change your birthdate, time and location here.
If you're not able to change your birthdate in the app because it keeps defaulting to today:
Please manually update your app (requires iOS 14.2 or higher)to resolve this leftover glitch.
If you cannot update your app or iOS, you can choose your year first, it will unlock the month and date. It's a weird 2021 issue where, because you can't pick a future date on the app, if the year is set at 2021, it won't let you pick a future month.
If you continue to experience birth info issues, please contact us with your CHANI account email, birth info, screenshot, type of device and operating system.