Can I edit auto check-in details after I submit it already?

Yes, you can. The flow depends on your device.

iOS

On the flight feed, you need to cancel the Check-in.

Then tap on the "Cancelled" word.

Go through all the screens to the screen with passengers. Tap on the passenger you want to edit.

Edit info and tap Done / Next. Then submit check-in again.

Android

On the flight feed, you can cancel the Check-in.

Tap Check-in.

Select the passenger which you want to edit.

Correct info and save it by going "Next". Submit check-in.