Note:
In case host and domain preferred credentials are already set for the Admin server target, they are automatically applied to the domain, and it is not required to click Apply.
Oracle EMAgent Target Host Credentials are the login credentials for the host on which the Management Agent, that is used to discover the WebLogic domain's Admin Server, is running. Oracle WebLogic Domain Credentials are the credentials for the Administration Server of the selected WebLogic domain.
To set the preferred credentials for a WebLogic domain's Admin server (that is, the preferred EMAgent target host credentials and the preferred Oracle WebLogic Domain credentials), from the Setup menu, select Security, then select Preferred Credentials. Select the Oracle Admin Server target type, then click Manage Preferred Credentials. In the Target Preferred Credentials section, set the preferred host credentials and the preferred WebLogic administrator credentials for the required WebLogic Admin server.
Click Next.