If you wish to change your username or profile name, you'll first need to login to your profile. Once you've done that, follow these steps:
1. Open the menu icon (3 horizontal lines) on the top left of the page. Under Settings select Account settings:
2. Under My account settings select change next to Username to update this information. Tip: your username can not be in use by another member, or contain any spaces or special characters (#*&%!):
3. Type in the new username you wish to use. Select change username when you're done.