The UN charter of human rights does not give us our rights. Some people consider the rights god-given, some consider that we have all negative rights until they’re taken away.
The UN is not the authority on human rights. It's just a weak, ineffective political body that represents no one in particular. Certainly not me nor you.
From the U.S. constitution: "The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people."
The UN has no power. It is not an elected Congress nor does it have sovereign authority of any kind. It has every country in it, even those that routinely abuse human rights. It is purely intended as a preventative body for war. It's not even great at that.