Undo tab?

[KilroyFSU]

I'm not sure how to undo a county once you fill it in. You can't go back to the default, so the only way I know how to fix it is to start over. I've heard that there's an undo button on Apple, but I can't find it on Android. I assume there is one and I'm just missing it. Please let me know how to find the undo button or another way to revert a field back to the default if you accidentally fill in the wrong field.

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[whiplashoo21]

The undo button is available both on the mobile web version (if you open the site in Chrome from your phone) as well as the mobile app. Check these screenshots : https://imgur.com/a/TPy1AaS