This is the same username and password you had created for your ME Interface in the Bios. I assume that you have configured AMT settings in the Bios.
I need more info on your system and configuration:
1. Which version of AMT are you using? Are you having the latest version of bios installed?
2. Please confirm that you have completed all the steps in configuring your AMT system as described in this Start Here Guide
3. Have you gone for Static or dynamic IP for your system?
4. Are you able to connect to the system through WebUI as mentioned in the Start Here guide?