Buyer wants to change a negative feedback to positive. How do I tell him how to do this?

[acem4]

Buyer wants to change a negative feedback to positive. How do I tell him how to do this?  I made the revise feedback request 3 days ago and he can't find it.  ?????

[rfmtm]

Tell buyer to look in his ebay messages, or his email spam folder, before the option expires.