That sucks. Unfortunately, the kit nibs can sometimes be problematic. In fact, one of the main reasons I switched to kitless pens was to get away from the cheap kit nibs and find a way to incorporate better nibs into pens. But that's an aside. MOST of the kit nibs are workable. So, apart from the advice above to clean with soapy water, a few other things:
-in answer to your question above, the feed/nib positioning varies from pen to pen, but as a guideline, try to get the flat tip of the feed close to the edge of the nib, but not over (so that the corners of the feed are just short of the edge of the nib).
-Try opening up the tines a touch in case they are simply too tight.
-You could try heating up the feed and fitting it against the nib to get a better fit, but that's a pain in the butt.
-If such things fail, you may have a bad nib/bad feed. Then best option is to try another nib and feed in thier place.
Ken