Welcome to Apple iPhone news and Chat discussion forums. iPhone Discussions is dedicated to iPhone,Talk about iPhone modifications,software,reviews,Support, iPhone news , iphone mobile,iPhone OS and more...
I have an apple ID on my Mac associated with a yahoo account and an older one on my iphone associated with a yahoo account.
How do I change the one on my iphone to match the one I have on my Mac?
Tap on Settings > Store > Tap on your AppleID
Select "Sign out"
Then sign back in with the other AppleID
Apple ID for what? You can have mutiple Apple IDs for different purposes. Are you referring to an Yahoo email account or iTunes Store account?
Reply something about How to change apple id on iphone or Post a New Thread