Help Please for a Beginner

Hi, I’m knitting my first jumper and I’m up to the neckband and it states to knit up sts along left side, knit across sts from front stich holder.
What does knit across mean?? The book has anexample of knit up but not across.

You are knitting the stitches on the holder so…across.

Slip them on a needle and knit them to be part of the collar.

Thankyou, of course so easy once you ponted that out. Now I can finish it off!
Thanks