I am knitting sleeve and What is this mean:k1,m1,k to the last st,m1,k1.
Welcome!
The sleeve is shaped so that it gets wider as you knit from wrist to underarm or shoulder. The directions are to make 1, i.e. increase one stitch, near each edge of the sleeve. You can do a kfb (knit front and back) or one of the increases shown here.
thank you very much