Are you accessing the Raspberry from Windows?
The SD card has 2 partitions on it, a smaller one containing what you linked above and a 2GB partition with data files including the www directory. Ubuntu mounts both partitions automatically, if this does not happen, you can mount it manually.
If you only have Windows, you can try to ssh into the box with Putty with "alarm" and modify the root password. I assume alarm has sudo rights, then you can try.
The SD card has 2 partitions on it, a smaller one containing what you linked above and a 2GB partition with data files including the www directory. Ubuntu mounts both partitions automatically, if this does not happen, you can mount it manually.
If you only have Windows, you can try to ssh into the box with Putty with "alarm" and modify the root password. I assume alarm has sudo rights, then you can try.
sudo -i passwd(First command switches to root users, second command resets new root password)