How to Crochet - Joining a New Ball of Yarn
Sooner or later you are going to run out of yarn. It's best to join the new ball at the end of a row for a neater appearance. When you're about to run out of yarn, work your last stitch until there are 2 loops left on your hook. Leaving a tail, draw the end of the new yarn through the 2 loops on your hook. Then continue working with the new ball of yarn. With a large-eyed needle, weave in the tails of both balls of yarn to secure. This method is also used when joining a new color of yarn.