MyPrintCenter allows you to change printing options (single vs double sided, black and white vs color, number of pages per sheet of paper, and number of copies) for jobs sent via email or uploaded, but not jobs sent via printing from a computer. (Jobs sent via printing from a computer only send data relevant to your selected print options, so there's no way to change options other than deleting that job, returning to the computer, printing the document, and carefully selecting your print options in the print window.)
To change print options in MyPrintCenter
3¢/sq. inch with 24" and 36" wide paper available (print out up to 72" in length).