I just noticed this post. To kpk into one stitch, knit, but don't slide it off. Bring the yarn forward between the needles and purl into the same stitch, again not sliding it off. Bring the yarn to the back and knit into the stitch again, then slide it off.
Hopefully you got it figured out by now, but in the future questions in the How-to sections get more immediate attention.
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