How to change your password on PS3
Changing your SEN/ PSN Account password on the PS3
You can also have a look at our FAQ Guide 'If you have forgotten or want to change your SEN account password' http://faq.en.playstation.com/app/ans...
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If you have any more queries, you can visit The Official PlayStation Technical Help forums for further assistance: http://community.eu.playstation.com/t...