How can I change the purchase order number on a renewal I have received?

 
How can I change the purchase order number on a renewal I have received?
 
You can fax in your request to 1-800-864-0019 or you may contact your customer service representative for assistance.

U.S. & Canada: 1-800-521-0600 ext. 72873
Customers outside the U.S. and Canada should call +800 4997 4111
International Free Phone Number Country List or  +1.734.761.4700 ext. 72825.
Email: core_service@proquest.com.