Hello from Amazon Selling Partner Support,
 
We understand that you and your buyer wishes to edit/modify their written feedback on order ID 702-5918939-0329047
 
After carefully reviewing your case,  we can see on your feedback manager that there's indeed a feedback left by the buyer. 

However, based on Amazon policy it is not possible for a buyer to edit or change the feedback that was already submitted. But, they can delete it completely.

Hence, we highly suggest you to contact the buyer to delete the feedback instead of trying to edit it.

For more information, you may visit the help pages below:

Download a report of buyer feedback
https://sellercentral.amazon.com/help/hub/reference/G202125660

When buyers want to remove feedback
https://sellercentral.amazon.com/help/hub/reference/202125690