"Registered agent" is short for "Registered agent for service of process."
Corporations, LLC's, Limited Partnership are legal fictions; i.e. they do not exist in any corporeal form, only in the minds of man. So, if you wanted to sue one you can't find it at home or on the street somewhere. Accordingly, in order to exist, each legal entity must appoint a registered agent to whom you could hand notice of a law suit; i.e. service of process.
A registered agent is usually a human being, probably the attorney who drafted the filings for the SOS web site. An attorney who does a lot of business formation work could be the registered agent for dozens of entities that have no practical connection to one another. A registered agent could also be an individual connected to the entity. Per the SOS web site, the registered agent need not be a human being:
The registered agent shall be an individual resident of this Commonwealth, a Kentucky corporation, a Kentucky nonprofit corporation, a Kentucky limited liability company, a foreign corporation, a foreign nonprofit corporation, a foreign limited liability authorized to transact business in Kentucky. The company seeking formation shall not act as its own registered agent. The registered agents address must be identical with the registered office.
Any authority to actually act on behalf of a legal entity; e.g. open an account, comes from some source other than being a registered agent.
In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.