1. Go to the classifieds top page.
2. Click "Profile" in the top right corner.
3. Then in the Profile page, click "Feedback" at the bottom of the column on the left.
4. Copy the URL, send it you your buyer, and ask them to leave feedback for you.
5. Once they've left feedback for you, you can then access their classifieds profile and feedback page to leave feedback for them by clicking their user name on your feedback page.