I took the back off 2 clean it 'K45 kitchen aide' ?

Now the screw in the middle that holds the bracket and nut on the other side of the lever that is somehow connected to the on/off/ speed doesnt seem to be going back together the way it came apart... yah uh well because i didnt know it was there.It will not even turn on!! Please help! I have to bake for BIG Baby Shower for my only daughter...