Thank you so much for the welcome, excited to be here!
I’m sorry, there was one typo in my description. There are 36 stitches cast on for the back of the neck.
The pattern is the Tee no. 1 by My Favourite Things. It doesn’t tell you what type of short rows to work, it leaves it up to the knitter to choose but in the overall workflow description they recommend using GSR.
I am stuck on the 2nd step (RS row).
Thank you so much salmonmac!
Now shape the back.
Begin with the left shoulder section (left when wearing the t-shirt) and pick up and knit 36 (39) 42 (44) 47 (47) 50 (53) sts along the long edge using 3.5 mm [US 4] circular needles. Begin at the stitches on hold facing out the way, and work your way in towards the cast on edge. The number of stitches is equivalent to 2 out of 3 sts. Ie.; pick up and knit in 2 sts, skip 1 st, pick up and knit in 2 sts, skip 1 st and repeat.
Then cast on 31 (34) 36 (36) 38 (38) 38 (41) new sts in extension using the knit cast on method = back neck stitches.
After casting on, return to working from the RS of your work. Pick up and knit 36 (39) 42 (44) 47 (47) 50 (53) sts along the right shoulder section. Begin at the cast on edge and work your way out towards the stitches on hold. You now have 103 (112) 120 (124) 132 (132) 138 (147) sts on your needles.
Break the yarn, turn your work to have the WS face you, slip the first 36 (39) 42 (44) 47 (47) 50 (53) sts (= right shoulder stitches) to the right needle of your circular needle, so that the first stitches you will work, are the newly cast on stitches at the back neck.
Now shape the back by working short rows.
1st step (WS row): Join in a new strand of yarn and purl the next 31 (34) 36 (36) 38 (38) 38 (41) sts (=back neck stitches), so you have 36 (39) 42 (44) 47 (47) 50 (53) sts remaining on your left needle. Turn. Next row is a RS row.
2nd step (RS row): Knit across the next 35 (39) 40 (40) 42 (42) 42 (45) sts = 31 (34) 37 (39) 42 (42) 45 (48) sts remaining on your left needle. Turn. Next row is a WS row.
3rd step (WS row): Purl across the next 40 (43) 45 (45) 47 (47) 47 (50) sts, until you have 31 (34) 37 (39) 42 (42) 45 (48) sts remaining on your left needle. Turn. Next row is a RS row.
Continue working short rows by turning 5 sts after the last turn on every row. For example: work to where you last turned, ie. the double stitch formed in German short rows, knit/purl the double stitch, work another 5 sts, turn.