Changing the email associated with your account is a simple process that can be done within your dashboard. Please follow these steps:
Log in to your UptimeRobot account and navigate to account settings.
Then you will see 'Account Details'. In this section, you can change your account email.
After changing your email, a verification email will be sent to your original email address to confirm the change. Make sure you check your inbox and spam folder for it.
Open the email and click the link inside to validate the email change.
After you've confirmed the change via the verification link, your new email address will be saved as your username. From then on, this is what you would use to log in to your UptimeRobot account.