For our melody, I feel it is important to use a widely recognized tune. To this end I have selected Frere Jacques. Lame perhaps, but everybody should know the melody. We will use the key of "C major" so there will be no black keys, and this song has only one chord....."C"

In the Mixer window, under Track Name, you can click on the track to name it: let's call it "Lead." The Type should be set to Instrument, and by clicking on either Device or Instrument, you can bring up a list of instruments. The default is Acoustic Grand Piano, which is fine for us. Your Mixer window should look like the screenshot below.

Now that we have set the track properties, we are ready to start entering notes to the track. This is done in the Composer window. Change to the Composer window by clicking the "Compose" button.