Hello Experts!

I am trying to connect to the OEM console, but whenever I open it up, it always ask that "I must have specified at least one management server.". ( I really don't know how I can figure out the management server). I am running the oracle 8i Enterprize version(8.16) on my NT server(Local Host), and install OEM (2.1) on same machine.
Any advise or informations will be helpful for me. Thank you.