The 'J' key is under your right index finger. (see keys highlighted below)
The 'U' key is above the 'J' key, reach up to hit it. (see keys highlighted below)
Once you learn where these keys are, try to type them without looking at your fingers. To make a capital letter, press the shift key with the pinky finger of your other hand at the same time as you press the letter key. Scroll down if needed to type the following:
When you feel confident you can type these keys without looking, go on to the next lesson.
(You must get 100% accuracy to move to the next page.)