If you are already register in your platform, I can't go back to blank your user.
But what you can do is reset your password!. Follow this few steps below:
Change my password from deskstop site
1. Enter "My account" form upper button.
2. Click in "Change Password" from the side menu. There you can enter your new password.
Done! Remember to save changes before you leave the page.
In case you cant enter your account, you can also reset your password from login page. See the step-by-step in the following link: