I am knitting my first baby cardigan. It is knit from the top down. The body of the cardi is finished and I am now at the part of the pattern where I need to work the sleeves. I have never knit sleeves before, so I want to make sure I do this right. The pattern states to "pu 4 stitches on the edge of the few that were cast on, knit the other 23 and join in round." There are 23 stitches on my scrap yarn...so does this mean that I need to pu the 4 stitches that are knit before the purple yarn in the pic I provided? Since they are already knit, how do I do this? I cannot find any videos helping to explain this to me so I am hoping that someone here will have the answer and/or a video link!