I've generally been navigating using the red "Next Arrows" above the video area. When clicking these I went from RP2 into Blues Primer 2 and continued to be taken thru the Pentatonic lessons there. After the scales, I am left in the BP2 area, chapter 2.
I suspect I should be returned to Rock Primer 2, Chapter 2?
(However the Basic Lead techniques chapter in BP2 looks promising, so I don't mind the diversion. RP2 could probably use a page there to apply the pentonics before jumping in to the 7th's.)
...so ever since then, I always hang on to the buckle.