need to change my apple id
want to change my apple id on my phone to another already created.
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To me it sounds like you want to sign out of one ID on your phone and sign into another. How you do this exactly depends upon a broader context of your reason for doing this. Here's the simplest way but may leave a lot of data on the phone from the old ID.
Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac - Apple Support
Sign in with your Apple ID - Apple Support
If another Apple ID is signed in you may need to enter the password for that ID to sign out of that ID first.