Don't shoot me down, but looking at your picture, you need a USB type A connector, and the pinouts (ignore colour on wires) will be
1 +ve (most left I think on your board)
4 Gnd (most right ... nearest your C39 ident).
Check with meter that 4 (GND) connects to connector mount lug holes (by your R2 & R3),
wiki link to USB connector standards.
Hope this helps