Bookshelf Online
You are able to navigate directly to a page in your textbook by using the page number box, which resides on the scrubber bar menu.
To access the full scrubber bar, tap/click the 
button at the bottom right.
You can see the page number which you are currently on. Tap/click the page number to type the page number which you would like to be taken to, then tap/click Return/Enter.