To apply and confirm your eVisa you need to have:
Passport Size Photo
Residence permit if you are not national of the countries listed as "Eligible Countries"
After you receive the approval by email:
Your granted approval will be sent to your email address. Your granted approval should be submitted in the airport of Addis Ababa Bole. You will need to present the passport you used to apply for your eVisa, and the International Certificate of Vaccination against Yellow Fever.