Frogman,
I've done a refund on Delta, Jetblue (myidtravel site). Just click on the refund on the top the page. My credit card was refunded within 24 hours. If you are using IJourney (AA ticket), you won't be charged for the ticket until you travel, so no refund needed.
No need to do a listing, if you are using myidtravel site since listing is done automatically when you pay for the ticket. I believe you need to make a listing, if using IJourney (AA ticket) @http://ifc.id90.com. You'll find the specific information (such as username, PW) you need to input on IJourney under Interline Listing Procedures.
Hopefully this helps. Take care.
Mach .80