You need to set permissions within SSRS in two places to give yourself initial access. The set-up program only gives access to Builtin\Administrators, to gain access in order to do this you need to right click you browser link and choose Run as administrator.
- Run internet explorer as Administrator
- Open the report Manager URL, this time you should get in
- Go to Site Settings in the top right
- Click Security then New Role Assignment
- Enter your domain\username and select System Administrator, click ok
- Add other users as necessary
- Click home, Folder Settings, then New Role Assignment
- Enter your domain\username and select Content Manager, click ok
- Add other users as necessary
- Re-open internet explorer (non-admin) and recheck the url.