Change of AppleID email address
Please how can I change my Apple ID email address into my address because I was using my sister’s own .
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If you set up your device, using an active Apple ID from a different person, you should create your own Apple ID, disable the Activation Lock on your device, and set it up with your Apple ID.
How to remove Activation Lock - Apple Support
To change the Mail address for your Apple ID, follow the steps mentioned in this article:
Change your Apple ID - Apple Support
There are a few things to do after you changed it:
What to do after you change your Apple ID or password - Apple Support