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Tap on recent task manager,you should have the small app there.But it should also be on the app menu.
If you go to settings-apps-all,can you scroll down and find it?
Ask about it a staff member,see what they say:
http://talk.sonymobile.com/t5/Welcome/Community-users/m-p/634967
My suggestion is for you to download Google Keep, its awesome, and you can sync it with your gmail account and access your notes on any device
Anytime, plus you can add it as a widget on the lockscreen