Similar to an automotive seal, if it has a beveled edge it should down. Place the ring on the piston groove (don't worry), it should look like the ring is side by side with the piston. With that in place, roll the ring along the groove, making sure the opened end flings on top of the piston. While rolling the ring along the groove, it should end up screwing it's self into position on the piston groove. Start from the bottom grove if it has multiple scrapers.
Other way is buy a ring spreader tool and a compression tool from any auto parts store. This will come with instructions and you'll get the hang of it in no time.
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