Who administers direct democracy mechanisms at the national level?

Constitution 1993 (with amendments in 2000))http://www.ecs.sc/resources/Constitution_.pdf

Article 115 1. There shall be an Electoral Commissioner who shall be appointed by the President from candidates proposed by the Constitutional Appointments Authority for a term of office of not more than seven years. [?]

Article 1161. The Electoral Commissioner -a. shall be responsible for the conduct and supervision of the registration of voters and ofelections and referenda under this Constitution; [?]