Step 1: Main body
R1: Magic ring, 6 single crochet
R2: (1 single crochet, increase 1 single crochet) ☓3
R3: (2 single crochet, increase 1 single crochet) ☓3
R4: (3 single crochet, increase 1 single crochet) ☓3
R5：change yarn color，（4 single crochet, increase 1 single crochet）☓3
R6：change yarn color，（5 single crochet, increase 1 single crochet）☓3
R7：change yarn color，（6 single crochet,increase 1 single crochet）☓3
R8-R9：change yarn color，24 single crochet in total.
R10：fold it in half, 12 single crochet
Step 2: tail
Choose two center stitches to crochet, starting from the 6th stitch,（chain 3, 2 double crochet, chain 3, 1 slip stitch ），1 slip stitch to reach the next stitch, and repeat 1 more time ( chain 3, 2 double crochet, chain 3, 1 slip stitch ）
Step 3: fins ☓2
Chain 3, 3 double crochet, chain 3, 1 slip stitch