Use thin short piece of wire and decide where to put it so it will not be in interference with other components inside assembled camera. The wire will be connected to both sides of the main board.

Cut required length of the wire and cut the insulation on its ends.

Optional: use some electrical adhesive tape (not very sticky) to hold the wire on the right place while soldering. Watch where are you putting it - not over any small sensitive components

Solder the wire to the pins as on the pictures