@Mardy-and-Kate0 Reviews can't edited once they are published. Even if a guest contacts Airbnb to say they made an error because, for instance, they meant to click on 5*s and accidentally clicked on 1*, Airbnb won't change it.
A review can be edited for 48 hours after it has been written, but not after it has been published.
What either a host or a guest can do, though, is ask that the review they submitted be deleted entirely.