Before you can use this skill you will have to link it with your Amazon account inside the Alexa app.
Start out by opening the skill by saying “Alexa open mobile notes”. Then you’ll want to create a list, say something like Alexa create shopping list. Once you have a list you can “add” items to it by saying something like “Alexa add milk to shopping list”. You can remove an item from a list by saying “Alexa remove milk from shopping list”. You can have Alexa read a note by saying “Alexa read shopping list”. You can find out what “notes” you have by saying “Alexa what notes do I have”.