Housing/Roommate Selection

I think I have the roommate selection process down, but can anyone clarify for me if I am doing something wrong? My date to pick a room is Wednesday at 4 PM and my roommate and I have selected each other as a roommate as well as creating the same PIN. My date to select is before my roommate’s date to select, so when I select on Wednesday what does my roommate have to do? Anything?