You can create an account at any time, either before placing an order or during checkout. All your orders are saved and remain accessible from your account.
If you forget your password, simply use the « Forgotten password » option to set a new one.
If you paid using the « Pay with PayPal » button in the shopping basket, your account was created using the email address linked to your PayPal account. In this case, you will need to reset your password to access your account.