To change your username, you can typically follow these steps:
Log in to your account using your existing username and password;
Access your profile settings: After logging in, you should have access to your profile settings - Appearance tab. This is usually represented by an icon or your profile picture in the top right corner of the screen. Click on it to access your account settings;
Scroll down to Avatar & Title section, edit your username (profile title) and enter the new username you'd like to use;
Save changes: Once you've entered your new username, make sure to save the changes.
Keep in mind that the exact steps and options may vary depending on any updates or changes made to the platform.