You can reach beyond the upper row to the numbers row. In this lesson we will only deal with the 1, 2, 3, 8, 9, and 0 keys. The finger assignments for these keys work like this:
LEFT PINKY: 1-key
LEFT RING: 2-key
LEFT MIDDLE: 3-key
RIGHT MIDDLE: 8-key
RIGHT RING: 9-key and 0-key
You could also reach the 0-key with the RIGHT PINKY, but most people will find the RIGHT RING finger to be more appropriate.