Does anyone know how to knit a circle? 
Knitting Circles?
You mean a flat disk…like a coaster? These are felted, but you can see how a circle is made and adjust to your needs.
http://www.knittingatknoon.com/coasterspatt.html
Knit a circle? Well, simple. Just take a set of 6 double-pointed needles. Cast on 1 st on 5 of them - total of 5 sts. Increase 1 st every round in every needle. Presto! one circle.
Dot