To set rankings, do the following:
Click the Data Points drop-down and select the data point for which you want to select ranks.
In the Available Rank Columns area, click the desired rank and click Add.
To remove a rank, click on the rank and click Remove.
To remove all selected ranks, click Remove All.
To move a rank up or down in the list, click on the rank and click the arrow buttons.
To change the settings for a time period, click on the rank and click Settings.
To close the dialog box, click OK.