The item in the center hole is called a 'well nut' (it has other names, too).
You need to grab it with fingertips and gently twist/pull it out of there.
Then place it into a different hole (sometimes easier if you thread a bolt into it and push on the bolt).
Repeat at other locations, reattach wind screen, ride, smile, then realize that it didn't make much difference where the windscreen was located (IMHO).
Have a nice day.
L2V -- she's a stocker!...and gone...
2011 MG Stelvio