8x10 Picture Frames Rustic Brown with Mat Photo Frames 4 Packs for Tabletop or Wall

How do you install those 3 prick things into the frame and on the wall ?

where does the 3 prong plastic get attached to the frame?

Can you attach d-rings? I’m looking forward t frames for show but need to have d-rings and wire to hang

What exactly is the dimension of the frame itself? Not the package dimension. Also the depth of the black frame and the width?