I'm thinking that what you are looking for is what I have shown below.
Go to player's profile, choose drop down menu for Actions on the right hand side of the screen, pick Set Game Strategy and then on that screen choose the drop-down menu next to Force Start/Use at Position.
Now I play as GM and manager so I'm not entirely sure, but I believe depending upon who your manager is they might have the power to ignore this command from you. But generally speaking this is how you do what you are trying to do.