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Before you add a database instance target on another server, you first need to deploy the agent to the server where the database runs.
Go to the Setup menu, then Add Target, then Add Targets Manually. Make sure "Add Host Targets" is selected and click "Add Host". You'll have to specify the hostname and operating system and step through the deployment steps.
See the instructions in the EM12c administrator's guide: http://docs.oracle.com/cd/E24628_01/doc.121/e24473/discovery.htm
After the agent is deployed and the host has become a managed target, you can then either add the database instance manually or use the auto-discovery features.