The default installation has no protection activated to make the first setup as easy as possible. After the installation you can open the user interface by simply browsing to http://ip:3344. That is because the software works as a web server to allow remote interfaces to communicate with it. That is why you can use it from any computer in your intranet.
That of course also means, that everyone with access to your intranet can do the same. For most private users that is no real issue. It is bound to your home and you have normally not opened it for others to the internet. So only persons in your household (assuming your wifi router is password protected) can access it. But until now they all have admin privileges!
If you are in an uncontrolled network or you want to limit permissions to certain users or if you plan to allow access from the internet, you should go to “User Registration” and add some accounts. The first one you create is automatically the admin account with all privileges. Use that only if you need to change configurations. For all other usages you should add users with the proper permissions.
Caution: There is no reset password function! If you loos the admin password all you can do is delete the password database and recreate all users!
Special handling of our Raspberry Pi image
When you use our raspberry pi image, it comes with preset passwords everyone knows. That is the default user of the linux os with name “pi” has the password “raspberry”. The access point has the password “12345678”.
To change the password of user pi you need a ssh client. All modern OS have a command ssh on the command line. So just log in with ssh pi@ip_of_server with old password “raspberry”. Then enter “passwd” to change it to one only you know. If you have no ssh, use https://www.putty.org/ for windows. With newer images you can also try using remote desktop connection. After login you can open a console with right click where you also can send the “passwd” command.
Securing the access point is luckily easier. Go to Main Menu->Global Settings->AP and change the password. At that point you should also change the server name, ssid and set your country code if you haven’t done it before. Especially if you get multiple printers all having the same name is not so helpful.