The type of chart you want to display is controlled within the PROPERTIES section of the WOW Builder:
The specific "types" of charts are included in the list below with a hyperlink to a descriptive details page. How you decide which chart to use depends on several factors. Bar charts give a good overall picture of your data but can be difficult to read when there are numerous bars. Bar charts also imply that data values are frozen. If your data continuously changes over time, a line chart might be a better choice. If you want to compare the percentage of one data series (a single bar) to the sum of all data series (all the bars), a pie chart works well. Multi-series charts will allow you to plot data for multiple datasets. Click on the links below and review each of the detailed pages below for more information.
Single Series
Multi-Series
Combination
Stacked
Instrumentation
Custom Objects