It means that row 5 will be the public (or right side, RS) of the piece, the side that faces outward. The next rows are going to be stockinette stitch with the knit side as the RS.
Since the pattern is given in rows and not rounds, it sounds like you're just using circulars to knit back and forth (knitting flat) without joining. Maybe the pattern asks for circulars because you have a large number of stitches? What is the pattern that you're making? is there a pattern link?