Hi,Welcome to JustAnswer
I am really very very sorry for replying so late. In this case you would need to change your apple id by going into settings Settings and then Store (Apps). Scroll to the bottom of the page and you will see the Apple ID. Tap the Apple ID and then choose Sign Out on the pop up options box. Then tap Sign In on the next screen that is displayed. Use the Apple ID you want to use from now on.
Above is the workaround to resolve this issue. otherwise you will have to purchase your apps again with your new apple id .
Please let me know if you have any other questions on it.