This photo needs much better detail: please reshoot it zoomed in much closer. The "black plastic tab" (white even in the photo)is a tiny clamp at the front end of the assembly, furthest away from the cable. It pivots upward from the end of the connector nearest you towards the cable.
Yeah; Michael’s bit about the inner retaining bracket (“plate”) needs to get put into the main instructions here.
This photo needs much better detail: please reshoot it zoomed in much closer. The "black plastic tab" (white even in the photo)is a tiny clamp at the front end of the assembly, furthest away from the cable. It pivots upward from the end of the connector nearest you towards the cable.