Most keyboards have a control which can automatically add an ending to songs you are playing. Press the ending button when you have finished playing a song.
In this section, a chord symbol is only written above a bar when it is necessary for you to press a key or to change chords. For example, in this song, just press the C key once at the start of bar 1, and let the keyboard play for two bars.
You can now play the chords to accompany the melodies of the songs in Lesson 3 , i.e., In the Light of the Moon and Merrily. Go back to Lesson 3 and practice playing the melodies of those songs with the C and G chords. Remember to take your finger off the chord key immediately after you have played it, but keep your left hand fingers close to the keyboard, ready to play the next chord.