To jump to a specific page, simply type the page number in "Page Indicator", located in the lower left-hand corner (highlighted) in the Lix app.
Different book structures
Some books have different page numbers because they've been converted to EPUB-format. You can determine if you have an EPUB book by looking for the yellow icon above the Page Indicator (see below):
If you have an EPUB book, we recommend using the chapter headers in the table of contents to navigate.