All changes are in bold.
In the Note section, "It is worked sideways by knitting all rows and utilizing short rows to shape the crown.
Consider the cast-on row to be a WS row; it is the pair to the RS row...first knit row is the RS row of the first Garter ridge..."
CO 11 sts in CC and 51 Sts in MC
Work from Gradual Rib chart starting on the RS of ridge 1...
...in the Gradual Rib chart, ending with the RS of ridge 26.
...following the color pattern on ridge 26...