Replace sitecake/credentials.php with credentials.php.default and reset password
Open sitecake/ folder and find credentials.php file. Delete it and create new one by renaming credential.php.default to credential.php. The password will be reverted to 'admin’.
Now go to Sitecake login and click Change password link to change password to the one you can easily remember. That’s it
NOTE: Don’t be lazy and leave 'admin' as default password for your website.