Signing the DS-260


So, I filled out the ds-260 for my father, and put my name and information as the one who filled it for him.

now at the end he needs to sign his name. so I gave him the credentials to login and finish this part and submit the application, however this has been hell. even though I made a video and a PDF explaining step by step how to do this very simple task. They still have no idea how to do it or how to use a computer it sounds like. my brother is helping him. but it sounds like he is more retarded than my father... I feel like I asked my 2 year old to build the next spaceX.
Anyway, my question is, can I just put his name and passport and sign it. or he needs to do it himself? I have been waiting for two weeks and all the did is frustrating me.