How to change email address on a ps3???????????????? NeEd HeLp?

Ok my sister used the same email address on her psn account that I did, so now when I go to sign in it says that you can not sign in using someone elses email address, I tried changing the email address and it wont work, my sister says I can delete the psn id. But I don't know how to do that. Help me please!!!How to change email address on a ps3???????????????? NeEd HeLp?Do this on the one that can sign in to Playstation Network

Sign in%26gt;Playstation Network%26gt;Account Management%26gt;Account Information%26gt;Email Address%26gt; then you can change it.

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