Sweater and shaping neck band

So I’m working on my first sweater. This is a supposedly simple pattern using circular needles. I’ve finished shaping the neck for the left front. I placed the remaining stitches on a stitch holder per directions and am now supposed to “join yarn to work the remaining 33 stitches”. But how do I join the yarn without binding off the stitches on the stitch holder?

Transfer the sts from the holder to the needle. Hold the yarn tail (about 6 inches) in your left hand alongside the left needle and start knitting. Follow the directions for the right front.