You are probably using the CUPS print system. I would try accessing the CUPS web administration software. Start any web browser and set the address to http://localhost:631
. You should see a web page appear. Go to the printers tab. Select your printer and click on "Start Printer".
Play around with the interface. If it asks you to log on to a privileged account I always use the root account. However, even though I use Kubuntu I set the root account to have a password that I know so it is easy for me to log on as root.
One way to set the root password on (K)ubuntu is to use sudo to run the passwd command.
BTW if the question is so simple why do you need help? I wish people wouldn't write "This is an easy/simple question." Everything is easy when you know how to do it. Similarly, everything that you don't know how to do is difficult.