You basically just push them into the gap and then the two screws fix it to the head. I wouldn’t bother though. (You might have to undo the rear subframe to get them in.... I can’t remember because mine was already off when I removed them).
It is the orange piece in this diagram. Looks like it is held by 3 screws (bolts... whatever!), 2 that are in your piece, the other one through the cutout near the bottom (just down by the shock spring).
Depends what bike you have. I'm pretty sure these only appeared on the 1199 in 2013. I don't think the 2012 had them. I think the 2013 rocker cover has modified bolts to which this cover fits, and the bolts have a spacer to keep the plastic away from the engine. TBH personally I'd leave them off. Panigales need all the free moving air around the engine they can get.
As stated, 2012 models did not have any fitted, I have always taken mine off as I think they look shit.