For security reasons, you should change the built-in administrator account's password. Click on the Change password link at the bottom of the screen and you will be presented with the Change Password screen.
On this screen you will be prompted to enter the current password ( test, by default ), followed by the new password to use for the built-in administrator account.
ProTip: Choose a highly secure password as the admin account has access to the entire system
Click Save and then navigate back to the setup index.
Next up, Organisation Settings.