Hi there! I understand you want to sign in to your Nextdoor account using your updated username. Just to clarify, are you referring to a change in your profile name (the display name others see) or have you changed the actual email or phone number associated with your login?

Usually, Nextdoor login requires your email address or mobile number paired with your password—not the profile username. So if you changed your display name, you still sign in with the same email or mobile number and password.

If you updated your login email or phone number, you’ll want to use the new one to log in.

Here’s how you can sign in with your updated login details:

1. Go to the Nextdoor login page: https://nextdoor.com/login
2. Enter your updated email or mobile number in the first field.
3. Enter your password.
4. Click "Log in".

If you have forgotten your password after the change, you can click "Forgot my password" on the login page to reset it.

If you are trying to log in via social accounts like Google, Facebook, or Apple, just select the appropriate option below the login area.

Does this match your situation? Let me know if you want help with something more specific like changing your profile name or updating your email address tied to your account!