How can I change the ringtone of the outside doorbell. There still is a Christmass song playing. Very anoying

Some how a Christmass song is selected in the outside doorbell. I like to change it into a normall ringtone but have no idea how to do that.

I just installed mine the other day. To change the ring tone, you have to unplug the ringer from the wall and that is where you can change the ringer. I believe there are 5 choices of ring tones.