Cast on 91 stitches with colour A.
For the stitch follow the instruction of the original pattern.
I continued to work with colour A as the main colour for about 85 cm (33,4 inches).
To change the colour of the main yarn, make another row knitting with colour A, then, working with the colour B simply knit one row; then simply start the row I of the pattern with the colour B.
Work until this part measures about 52 cm (20,4 inches) or until you reach the length you desire.
With colour B bind of all stitches knitwise.