Help with the heel

I’m knitting my first sock, Chevron Lace Socks. I’m at the heel flap and the pattern reads, Place 20 sts from needles 1 and 4 on one needle. I am confused, if I take the sts from needles 1 and 4 my working yarn will be in the middle of my work. Can someone explain this to me? I found the pattern at www.knittingonthenet.com

I always find this confusing too.
What you’re going to do is knit a round, then when you end on needle 4, knit the stitches from needle 1 onto needle 4. Just keep using needle 4 to knit. Then you’ll have half the stitches on 1 needle and you’ll be working with 3 needles. You’ll then leave needles 2 and 3 and just work the stitches that you’ve put on one needle.

Thank you! Sounds simple once explained! I’m sure I’ll be stuck again!