Pin to top in iOS

I bought premium version but I can’t pin to top a note in iOS version. In MacOS is crear but in iOS I don’t understand how to do it. Can anyone help me? Thanks

Tap the orange dot left of the title of the note and a menu should appear of which the last of three options is to pin the note. Alternative you can drag a note to the top of the list and it should ask if you’d like to pin it.