The third section has 1/8 notes and 1/4 notes. To get an understanding of timing, try altering the length of the notes and see how it affects the melody. This is how measures 5 & 6 should look:

Try playing back the notes you have entered for measures 5&6. They should sound like this: <em>Your browser doesn't support EMBED, but you can still listen to the sound b</em>y<a href="fj/fj_5_6.mid"> clicking here.</a>