I have setup the demo version (RP2.1), I have connected it to my cuibes, I have created a few test reports (mainly OLAP but also some Tree Maps) and there is no way to edit them. I am logged in as admin (u:admin, p:admin). The only thing I can do if I want to change something in a report is to delete it and create it again from scratch.
It seems that you can make some OLAP reports and save these reports and view the reports. But clicking on the open reports button you should be able to open an existing report, change it and save it again.