On the left side of the page you will see a red arrow pointing to a tab titled "Pages". Click on that tab and thumbnails of each page will be shown with the page number below the thumbnail as you see here. You can click on any page and go directly to that page.

The blue arrow points to the page number in the Table of Contents.

The green arrow at the bottom of the page points to the number of the page you are currently viewing and the total number of pages in the e-book. You can click on the arrow to the right or left and move through the book one page at a time. If you click on the double arrow to the left you will go to the first page. The double arrow on the right will take you to the last page of the book.