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The double yarn over is creates the buttonhole. Bring the yarn forward between the needles then wrap it over the top and back between the needles again ending with it on the front side of the work.
Working into the back of each YO is kind of fiddly and awkward. When you get to that point you'll see the two yarn overs. Instead of going into the front as usual you stick the needle from right to left into the back loop, knit and the take it off the needle. Do it again. There are instructions in the video section, too. Look at the glossary and find k tbl.