Hi it was long time ago I wrote something so lets continue. you installed and configured ACS but you want to see reports. How to do it.
Log in to your SSRS server where you already have deployed SCOM reports and make sure that everything is working properly first.
After that copy ACS folder from installation media in ReportsModel folder to you server for example to C:\ drive
Run PowerShell or cmd and run next command
.\UploadAuditReports "myAuditDbServer\Instance1" "http://myReportServer/ReportServer$instance1" "C:\acs"
Result will look something like this. Ignore warnings
After that open Reports web page. Usually http://server:80/reports and open Audit Reports folder
Select show hidden items if it is not already checked
Click DBAudit source. Setting should be looking like this
Open one report in console and try to test it
It should be working