If you’ve outgrown your username or changed your branding, you should update your social media details. Here’s how to change your Twitter handle.
Log into your Twitter account with your current details, and head to … more on the left of your dashboard, and then click on Settings and privacy.
Click on Your account, and then Account information.
The first field in your Account information will be the username, click here.
Decide on your new Twitter handle or username, enter it, and then click Save.