First check the registration period, and if you just check out the universities website you will get more information, but basicaly you have to go to the campus located at sidist kilo

Yedistance mastawekia siweta Main campus (6 kilo) bemehed apply madreg new mitebekbh.

http://www.aau.edu.et/offices/v_president-office/office-of-the-academic-vise-president/continuing-and-distance-education-office/distance-education-programs/