U need to go upload the pic on fb(recommended becoz easier),
then come back here once it's uploaded, then see the picture icon
at most left on the typing area here? Click on it, then go to fb
for the pic again, then left click on the pic, then right click and
press copy image location, then paste it at the sgforums pic
window(at the place which show URL), then no need care abt the
height this and that.