Welcome to CD Freaks
You can access the user manual by going to the Philips product page on this link, then click "Support" and under the product support menu, click "User Manuals"
The default password for your player is "136900".
According to the Philips website, if you cannot unlock a disc with the password, it can be removed by updating the firmware of your player. Updated firmware can be obtained on the "Software & drivers" section under the same "Product support" menu.