Leave the first string open This is the smallest string. Don't press down on any frets. This string will play the note E.
Position your first finger (index finger) on the first fret, playing the note C.
Keep the third and fourth strings open, playing notes G and D.
Play the low octave C on the fifth string by pressing down on the third fret with your middle finger.
Use your left hand to strum across the first five strings. Do not activate the sixth string.