For the riser, you wanna have the pcp behind the holes you screw into, meaning the pcp should be more towards the mobo and you're NOT trying to screw into the riser's pcb(meaning if you're trying to do this, the riser isn't even in all the way). If you have trouble fitting it, which you could very well be, I'd try lifting the metal plate up a little with a screwdriver so the riser can slide in easier. You can counteract this small bend with the screws when you tighten it down.
Sorry if that was a terrible explanation. I tried <_<
Sorry if that was a terrible explanation. I tried <_<