First, click on the Reports tab, and select the specific report you would like. You can choose from the Summary, Member, Channel, Post, or Source reports.
Next, use the Filter Report column on the left to select the reporting time frame, which defaults to the Last 30 Days. Then, select the specific Post Tags and/or Distribution Groups (your Member Groups) that you would like to filter the report by. Finally, click the Refresh button to update the Report.
You may not notice much change in the line graph displayed. The line graph is a simple way to look for trends, but is not a comprehensive report by itself. To get access to the full report data for analysis, click the Download button in the upper right hand corner. This downloadable report has much more data than is displayed in the graph, and can be further analyzed with a tool like Microsoft Excel.