How do I add a person(s) to the register or remove a person(s) from the register?

If an owner has died, see What do I do when a property owner dies?

All additions of person(s) to, or removals of person(s) from the register, other than through the death of an owner, will require the current owner(s) to sign a formal transfer of the land/property to the new owner(s). See How do I transfer my registered property?