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. Tie the yarn onto your crochet needle by making an adjustable slipknot near the tip. . Crochet two chain stitches from the loop on your hook. . Work two single crochets into the second chain from the hook, which also happens to be the first chain stitch your crocheted. Use a slip stitch to join the last single crochet with the first. You should make a round with six stitches total. Make one chain stitch from the loop on your hook to start a new round. Make two single crochets in each stitch from your previous round. Use a slip stitch to join the last and first stitches together. You should have a round with 12 stitches total. Make one chain stitch from the loop on your hook to start a new round. Single crochet into two stitches from the previous round, six times around. Join the final stitch with the first using a slip stitch. You should make a round with six stitches total. Weave the tail end into the stitches on the back of the button, using a darning needle if necessary.  Use your hands to slightly flatten the button. As you stitch or weave in your tail end, weave it through the entire thickness to keep it secure.

Summary:
Make a slip knot Chain two Make six single crochets Chain one and work two single crochets in each stitch. Chain one and make six sets of two single crochets. Weave the tail in.