Transferring stitches

I’m working on the One Skein Wonder shrug and am almost finished, just have to finish the ribbing, but I’m not sure what to do. The stitches from the body were transferred to a stitch holder while I worked the trim for the sleeves. After I did the sleeves, then it said to pick up stitches for the ribbing starting at the right shoulder seam. Then when I get to the lower back section, it says to transfer the stitches from the stitch holder to the needle, but what do I do with the yarn? Do I cut it and join new later? Or do I really knit the stitches onto the needle with the picked up stitches? Thanks for your help.

Transfer the stitches to a left needle and knit across them.

Thanks, worked great!