I'm in the middle of this right now...although I am attempting to do this via the "TTU" feature of Delta.com. I emailed them the information through their online form and they responded the same day with an email asking me for the e-ticket number. Huh? It's right in the form I sent them!
I replied to the email with the e-ticket number and the confirmation code and hopefully that does it. I missed a DEN-ATL leg due to the FAA screw ups on 19Nov which would have caused me to misconnect. They rerouted me on a UA Express direct flight which got me to ATL on time.
I'll update this thread when I get an answer from Delta.
-RM