Click "New Row" in order to create a new roster spot, they are sorted chronologically (When you create that row). You input a user by inputting their User ID and then certain info will populate. You can edit the unit numbers, ranks and status. However, in order for that status to stick you are required to click "Status Lock" otherwise it will change the next time the roster updates statuses. "Req Exempt" is a way to exempt a member from their requirements and will automatically mark them Active.