How to Weave Yarn Ends Up the Sides
After you knit, you need to weave the ends of yarn into the knitted piece. Here's how to weave in the ends up the sides of your work if you joined yarns at the side edges by tying the two ends together in a bow:
Untie the bow.
Don’t worry. Your knitting won’t unravel.
Thread one end through the tapestry needle and weave it down the side loops at the edge of your knitting.
Be sure to keep the end of your yarn long enough to thread through the needle.
Thread the other end through the tapestry needle and weave it up the side loops at the edge of your knitting.
You follow the same process for both ends of the yarn.
If instead of tying your two ends together, you joined them by working the two strands together for the edge stitch, use a tapestry needle to pick out one of the ends and then weave it up the side by following these steps. Weave the other end in the opposite direction. If the two strands are thin and won’t add much bulk to the edge stitch, don’t bother to pick out one of the ends. Just weave each end into the sides in opposite directions.