The workflow to add FIM connectors to a profile isn't as easy as it should be at the moment because we've migrated FIM to our new interface but Connector Profiles have yet to be migrated. It will be more straight forward once Connector Profiles are migrated.
Configure an agent that isn't currently part of a profile with the required connectors (including FIM which has to be configured from the new interface). Then create a new Connector Profile and use that agent as a template:
Once you have the profile created, you should be able to add other agents to that profile from the new interface: