application for Vietnam visa

hello,
I am visiting Vietnam in few days and I have a letter from the ministry of foreign affairs of the socialist republic of Vietnam says that I am eligible to pick up visa on arrival .. now my question is which application I should fill in as I found two applications in the website (one I must put a photo on top left, the other one photo is not mandatory),
Beside of that do I have to fill applications for each applicants ( for me and my family total of six members) or I only fill one application of all family members. please assist to avoid further troubles.