Proconnect self prepared

I have proconnent online version account. Also I have EFIN and all other details to file other ppl returns. 

I noticed there is an option to select “Self-prepared” in the preparer field box. What does it really mean?

 

My brother wants to his own return. Can be use my account? By selecting “self-prepared”? Will this work if someone wants to file their own return and not have me sign off on it?