db in the order of skipped stitches, not backwards

The video referenced above is correct, but the written instructions do not reflect the same pattern. You should work double crochet stitches behind the treble crochet, starting with the first not worked stitch, rather than in reverse order. So you work the first double crochet in the fisrt skipped stitch, the second dc in the second skipped sticth and the third one in the third skipped stitch.

Perhaps this YouTube video

Perhaps this YouTube video will help: http://www.youtube.com/watch?v=OtPlja2HMdI

Basically, after you work your tc, keeping the work facing in the same direction, wrap yarn around your hook and then insert your hook in the skipped chain immediately to the right of your tc, sort of like how you would do a reverse sc aka crab stitch. Work your dc and then wrap your yarn, insert hook into the chain immediately to the right of the dc you just completed and work the same way.