iCloud buying storage

[TyWahn]

Hi
I am trying to upgrade the iCloud storage for my son's MBA. HE has his own iCloud account for texting and FaceTime. But for iTunes its my account that i have used since the store opened. So that email is under the account under AppStore/etc
When I try to upgrade his storage, it has his iCloud acct and there is no way to change it that i can see.
Anybody else have an issue like this?
Thanks

 

[moxietown]

System, preferences, manage iCloud, log out, login as yours. Or use another device and upgrade it from there.

 

[ApfelKuchen]

Consider using Family Sharing. That way, all your iTunes purchases can be made available to your son, even if he's signed into iTunes using his Apple ID instead of yours, and he'll be able to purchase iCloud storage. Also, with iOS 11 (and soon, MacOS High Sierra) you could share an iCloud storage plan between family members.