There are 2 types of charts available: static and interactive.
Static Chart is very simple and gives you a “line-pricechart” view and it always shows chart for the last 90 days.
Interactive Chart shows candlestick chart for price and allow you to zoom data by selecting different time frame at the header of the chart. It also allows you to turn on/off some charts, like Moving Averages, for example. Just click on a chart name at the bottom (legend section) to hide/show the chart.
There is a video tutorial about interactive chart available (sorry for the old design and computerized voice – we are working on a new version of video tutorials):http://www.youtube.com/watch?v=AnWsoyv2rRc
If you prefer a simple version over an interactive one or vice versa, just go to “My Settings” and change your preferences (Stock Analyzer section, Default Chart Type).