Here's an example of both types of gas porting. The top one is lateral gas porting, which is the BigBlockFiero mod. You drill into the side of the top of your ring lands. The bottom one is vertical gas porting, which works a bit better than lateral ports, but wouldn't work on most two-strokes because of carbon issues.
There's a side view of a four-stroke piston with the gas porting. Look at the top ring land, you can see the gas ports. Don't pay attention to the big holes on the bottom ring land, those are for the oil ring, typical four-stroke nonsense. Hope this helps.