To log in as “root”, you can first login as user “user” and then use the “sudo” command to have “root” access.
You can reset the password for user “user” through the configuration item named “Remote Support Password”. Just enter a password there, it will be encrypted properly and written to the system. We only save encrypted (hashed) passwords, so we never know your actual passwords.
Here you will find a complete guide on how to do that.
IMPORTANT: Changing the password (or SSH keys) for the “root” user is not recommended. This allows us to provide direct support in case you need it. But if you wish to, you can indeed change it; the Player won’t be affected in any way.