K18, turn, p9, turn. On 9sts, work 12 rows stockinette. Break yarn. With RS facing, (9sts on needle), pick up 10 stitches along side of foot, 9 sts from toe, 10 sts along side of foot and 9 sts on needle (47 sts)
You haven't given all of the pattern before where it says to K18, etc. Evidently you have already made part of a bootie so that you have something that is the toe, and two sides of a foot. After you have knit back and forth 12 rows over half of the 18 stitches, you break the yarn there. You will have 18 stitches still on the needle, 9 of them that you have knitted 12 more rows on than the other 9.
I'm not sure which 9 stitches are the first ones mentioned: "With RS facing, (9sts on needle)". It sounds like you use one of the groups of 9 as a starting place, and include them as the first 9 on the needle (Maybe the other 9 or the other end of the 9 you did the 12 rows on. Look at things and see if you can figure out what would begin to make this look like a bootie.)
I have a few questions. Is this all worked flat? In the round? Or some of both? Is there anyplace we can see the whole pattern?
One of the groups of 9 is your starting point, and just past them you are supposed to pick up 10 stitches along the side of the foot part of what you have done already. Work so that the 10 end up right next to the 9 you start with. Then you are supposed to pick up 9 stitches from the toe of the bootie, 10 more along the other side of the foot and then the other 9 from the ones that were on the needle make the total of 47. It sounds like you could be knitting in the round after this if you haven't been before. You would need to be picking these 47 stitches up on a series of double pointed needles or use a Magic Loop, or 2 circulars.
Does that help at all? Sorry I can't do better without seeing the whole pattern.