So the pattern says. The right side is facing you; it is time to join in the round. Slip the last 4 stitches, on the end of the needle, to a cable
needle. Join in the round, be careful not to twist. Hold the 4 stitches on the cable needle behind the first 4 stitches on the needle. (Knit the first stitch on the needle together with the first stitch on the cable, knit the 2nd stitch together with the 2nd stitch on the cable needle) repeat with the last 2 stitches, you are now joined in the round and have only 4 stitches worked. Place your beginning of the round marker. 147 stitches
The problem is that when I follow the instructions my working yarn is on the left needle not the right so does that mean I need to attach another ball of yarn to make that work?