It means work the pattern without increases or decreases.. In this case continue this for the stated number of rows.
Pattern Stitch:
Rnd 1: *P4, K1*, rep from * to * to end of rnd.
Rnd 2: Knit
Here's the link which is always helpful when asking questions.
http://www.ravelry.com/patterns/libr...hat-and-beanie