If up to now the hat has all been in stockinette stitch, then that is the pattern it is referring to; ie, as you work those 11 stitches, continue in stockinette stitch.
If the pattern doesn't tell you which type of decrease to use, k2tog or knit 2 together should be a good one to use. If you go to the glossary tab at the top, scroll down to 'k2tog' for a video how to do it.
Mirl56 at Ravelry, too.
Learn from the mistakes of others. You canít live long enough to make them all yourself. Eleanor Roosevelt
Lady Feb Sweater
more shawlettes, socks