The small traces that goes from the 2 resistors to the leds are known to be the (-) side or contact points. The larger area almost underneath the leds is known to be the (+) side or contact point. From the (-) side of the leds both leds will be solder seperate following the small traces and from the (+) side of the leds, both will be solder to the larger area together. Its not really bridging but linking both (+) sides together. Good Luck...