Charts require some type of count, whether it’s a standard measure, or one that’s been created using the Variable Editor on the Edit Report page. 

Once the report generates, highlight the table and select Turn Into.  A selection of chart types will appear.  Select one and click OK.  Some users prefer to Copy the table and using the Turn Into option on one of the two tables.  That way the data appears in both a table and chart. 

Once a table is turned into a chart, there are a myriad of formatting options on the Properties tab on the left.  

[Needs image]
--For this chart, the Width and Height was expanded, the Palette was altered, below Values the data and segment labels have been shown, and below Y Axis the label has been removed.