To zoom in double-click the page. Double-click again to zoom out.
Alternatively you can use the magnifying tool located in the top-right toolbar.
While zoomed in you can move around the current page by clicking and dragging with your mouse.
Click the print icon in the top-right toolbar. A pop-up will appear asking you which section of the page you wish to print. Select either left, both or right respectively.
To download the document as a PDF, click the download icon in the top-right toolbar.