You can update your username in-app from your Profile.
Note: You can only change your username every 14 days, so if you’ve made an update recently and cannot change it now, try again later! If you’re not seeing a recent change, fully close the app, and open it again.
To update your username:
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Tap your profile pic at the top right.
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Tap your username below your name (ex @username).
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Update your username.