Allow sufficient cable for your connections at each end.
How to wire a wall light fitting.
Then turn on the light switch with all power off to the lighting circuits there is no power to the switch.
Fitting a patress box to the wall connect the box securely to the wall using the holes provided.
Take a length of 1 5mm cable and run it from the cable you have identified earlier through the hole in the ceiling and down to the switch and both wall lights.
Hold the red and black terminals of your circuit tester to a red and a black wire that appear in the same cable.
Attach this ground lead to the green ground screw on the mounting bracket by wrapping the wire clockwise around the shaft of the screw then tightening it down.