Can you change yarn in the middle of a row knitting?
If you run out of yarn in the middle of a row, your options are the same: Tie a temporary knot with both yarns, leaving 4- or 5-inch (10- to 13-centimeter) ends; or knit the next stitch with both strands, drop the old one, and continue knitting from the new ball.
Can you change yarn in the middle of a row?
To join new yarn in the middle of a row, when about 36 inches of the old yarn remains, work several more stitches with the old yarn, working the stitches over the end of new yarn (shown in double crochet). Then change yarns in stitch as previously explained.