Hi and welcome to Knitting Help!
I don't have
this pattern so I don't know what the stitch numbers are or what kind of decreases you're doing (possibly a double decrease?). If you have
k6, dec, k6, dec, for example, you would work
k4, dec, k4, dec on the next decrease row and k2, dec, k2, dec on the following decrease row. Often these decrease row are every other row with a plain row between but just do whatever row 2 of your pattern reads.