Question: how to do icord cast on?
Answer: Cast on 3 stitches using a long-tail cast-on .
Slide the stitches over to the left needle. ... 
Next, do a kfb (knit front & back). ... 
Knit the next two stitches on the left needle. ... 
Slide 3 of the stitches back over to the left needle, slipping as if to purl.