How to change username in Kiwi widget app?

here is kiwi widget app tap on your profile picture in top right and tap on edit profile and from here you can just change your username so finally it's available it wasn't available before but now after you update the app to version one to four it should be possible to do and then you can just change your username i don't know what are the limitations because in some apps you can only change username once or you can change it like uh yeah just a few times or there is some time break you need to wait one month before changing again i'm not sure if that's the case here but something like this

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