when you went through the install, it asked you for a root password.
your login is root
your password is whatever you set up. If this login does not work, you did not enter the same password. You have to reformat the drive from the Sony GameOS (press the power button and leave it pressed for 5 seconds to power it down from Linux. Then press the power button and leave it pressed for 5 seconds to force it to boot back up to Game OS). Go into Settings and reformat the drive and then set the default to Other OS and restart the PS3.
Then install it again and write down the password that you entered.
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