What do you mean by you can't get it to work? Don't you see stats on those reports?
Assuming you do, you can click on column headers to sort the reports by whichever stat you like. If you click on the Hands column header in the Summary tab report you will be able to see the players with the most hands at the top of the list. Similarly on the "vs Player" tab if you click the Times Won or Times Lost column headers, or "Difference" you'll see who you've won or lost most to.
The "Reports" tab is for custom reports and you won't see any data there by default - you need to select and run a report to see data there.
Tutorial: Custom Reports and Statistics