My nook will not skip pages or chapters. Navigation does not open.

The instruction say to "Jump to a different page. If you’d like to get to a specific page without having to turn each page one by one, simply tap the small triangle on top of the page number you’re reading (near the bottom of the screen), select “Go To,” and enter the page number that you want to go to, to immediately jump on to that specific page." but this small triangle doesn't do anything. When I touch it, a few lines on the page are highlighted instead. How do I fix or reset?