For Walmart Alerts, make sure you are in the WM marketplace and go to Alert Settings
To create an Alert click on "+Create Alert" 
A pop up will appear:
You have the ability to create an Alert for Product Reviews to be notified for Any Rating, Rating, Positive Reviews, Neutral Reviews, Negative Reviews.
When setting up the alert you can add the email notification recipient under the "Subscriber List Names" and choose the Products under "Product Lists" or click "Manage Lists" to edit/create lists.