You can lock a note to prevent unintended changes.
To lock a note, tap Lock icon at the information area.
Note's Information opens. Tap Lock icon.
You can't edit a note until you unlock it.
To unlock a note, tap lock icon at the information area. Then, tap Lock icon.
When you lock a note, URL, phone numbers, dates, e-mail addressed, postal addresses inside a note are detected and change to live links.
You can touch those links to open URL with Safari, open an empty e-mail message with that e-mail address, or open Maps to tap those links, etc.