Tap the tool button.

Tap the "Share" icon button.

Select the users you want to share the note with.

Tap the "Share" button.

From the menu, tap the "Shared Notes with Friends" tab to display the list of shared notes.

The note has been moved to "Shared Notes" and has been shared.

You can add users even after sharing.

Note: Only the creator of the note can share it.