First, you need to find where your report database is located on which server. The database is called "ReportServer". If you don't know how to track that, let me know but for a start, the URL of the report is the DNS (CName) which your network admin can tell you the location of the server. I believe you can also use "Ping -a TheURL" in a cmd to give you the IP Address too.
Second, the major table that holds all of the reports is called: ReportServer.dbo.[Catalog]
Many tables tie to this Catalog table, including a subscription table (for email and scheduling). There is also a Datasource table as well.
This database looks simple but it is not because more data are hidden deeply in those XML fields. Reading is the easy part. However, I recommend against making updates against the XML because it is super tricky to tie it back to the tables.