At first you need the BIRT designer. Is is recommended to use the release 2.3.1. You can get it there : http://www.eclipse.org/downloads/download.php?file=/birt/downloads/drops/R-R1-2_3_1-200809221151/birt-report-designer-all-in-one-2_3_1.zip
A BIRT report for Appspy is just a BIRT report. You can learn about BIRT here : http://www.eclipse.org/birt.
Birt Datasource configuration :

The parameters :

Detail of a parameter :

The datasets :

Choose the datasource :

Add the parameters :

Set the SQL Query :

Insert a chart for instance :

Start the preview :

Is it what you want ?

Change the parameters :

Use the administration application to create the report, add the parameters and upload the BIRT report file :
