I have two apple ID's. One is an old one I no longer wish to use, but it is the one associated with my iPhone. How do I change to my newer apple ID on my iPhone?

In order to change your Apple ID or password for your iCloud account on your iOS device, you need to delete the account from your iOS device first, then add it back using your updated details. (Settings > iCloud, scroll down and hit "Delete Account")

If you have used your old ID to purchase content from iTunes or the App store, you may want to continue to use this ID for iTunes only to avoid losing your content.

I don't see "delete account"