If you are on the SEPM server, then you can follow the steps below:
1. Start->Run
2, Type "inetmgr" and click on Ok
3. When the IIS manager comes up, you can expand the server, websites folder
4. Under default website or Symantec web server, you will find a virtual directory by the name Reporting
5. You can right click on that and click on Browse
6. When you get a login page, you can login to the SEPM through IIS manager
Although, it will give you access only to the information first three tabs in SEPM. If you want access to all the tabs of SEPM, then you can follow the steps mentioned the posts above.
Cheers,
Aniket