Who administers direct democracy mechanisms at the national level?

Electoral Law (2004), Article 155

http://aceproject.org/regions-en/eisa/AO/Law%20No%207%2004%2017%20of%20June.pdf 

The National Election Commission has the following competencies:

a) organise and direct the proceedings for the presidential and parliamentary elections, and other electoral activities in accordance with the terms of the applicable legislation, promote the objective knowledge of the citizenry regarding the election procedures and prepare and publish in the 3rd Series of the Diary of the Republic, the seat distribution chart according to the electoral constituencies for the parliamentary elections, as well as the results of the elections and any referendum;