Thanks very much for the link. There really isn't an exact answer to the meaning of this line or the following increase lines.
Row 7: K2, m1 in next 2 sts, k10, m1 in next 4 sts, k2, m1 in next 4 sts, k10, m1 in next 2 sts, k2 (50 sts).
Many increases will work so that it's a matter of personal preference. What is important is the way you count the stitches and the increases. Kfb is easy and it uses the stitch as part of the increase but if you don't like the bump that is leaves there are other increases. Your favorite increase between the needles will work, too as long as you use your plan A (thank you ArtLady!): m1, k1, m1, k1.