A horizontal scroll bar is located at the bottom of every chart.  This scroll bars lets you move forward and backward through the prices. 

Click the left scroll button to scroll backward through the data, and click the right scroll button to scroll forward though the data.  You an also click and drag the scroller to move in either direction.

Click the In button to progressively zooms-in on the most recent data displayed in the chart.  Each time you click the button, the closer it zooms-in.

Click the Out button to progressively zoom-out on all the data displayed in the chart.  Each time you click the button, the further out it zooms.

Click the All button to display all the available data.