HI,
On the Apple Support Profile Page - in the section about Personal Info - is the email address editable by itself ?
Some Items on this page used to be available to edit for me and one of those was the email.
It was how I changed the email my notifications came from Apple.
For me currently on the "Change Password" can be edited from that page (although that jumps to the Apple ID page).
It seems Apple have changed the way these two pages interact effectively blocking users making some changes.
On your Apple ID page you are seeing the Yahoo email as the Apple ID and the Google one as the Primary email ?
Do you have the box to change the Primary email to the Apple ID ?
If you do not you will have to contact iTunes Support
Start here
follow the link to the "Contact iTune Store Support"
Always chose the Manage Account options across each page.
Eventually you will get an email Link.
You can then ask them to change things or at least send you the info to your current email.
10:24 PM Tuesday; April 23, 2013
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.3)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously