Lock your notes on iPod touch
In the Notes app 
, you can lock notes with a password to protect your sensitive information. Notes uses a single password for all your locked notes in an account (for example, your iCloud account), on all your devices.
Set up your notes password
The password you set applies to all notes you lock from now on.
Go to Settings
> Notes > Password.If you have multiple accounts, choose the account you want to set a password for.
Enter a password and add a hint to help you remember it.
Important: If you forget your notes password, you won’t be able to view your locked notes, and Apple can’t help you regain access to those locked notes.
You can reset your notes password, but this doesn’t give you access to previously locked notes. The new password applies to all notes you lock from now on. Go to Settings > Notes > Password > Reset Password.
See the Apple Support article How to lock notes on your iPhone, iPad, and iPod touch.
Lock a note
You can only lock notes on your device and notes in iCloud. You can’t lock notes that have PDFs, audio, video, Keynote, Pages, Numbers documents attached, or notes that sync with other accounts. You can’t lock an iCloud note that has collaborators.
Open the note, then tap
.Tap Lock.
When a note is locked, the title remains visible in the notes list.
To remove a lock from a note, tap , then tap Remove.
Open a locked note
Opening one locked note opens all your locked notes in the same account for several minutes so you can easily jump into another note or copy and paste information from other apps.
Tap the locked note, then tap View Note.
To open the note, use your Notes password.
To lock your notes again, do one of the following:
Tap the lock icon at the top of the screen.
Tap Lock Now at the bottom of the notes list.
Close the Notes app.
Lock your iPod touch.