The Skype account(s) for the registered email address will appear on the screen. If you've forgotten your username, click the correct account in the list, then click the Sign in link to sign into this account on skype.com. Make note of this username so that you can also sign into Skype on your desktop or mobile device.
If you've forgotten your password, click the correct account in the list, then click the Reset Password button to establish a new password.