Gosh am I going crazy.... How do I enter the NEW MARKETPLACE feedback as a buyer and a seller???

Here is a response that I have received and I can't seem to make it work. Thank you in advance for instructions.

" New Question?? How do I enter marketplace feedback with the new system? Thanks*
---End Quote---
Find on of their ads and click FEEDBACK.
Or, find one of their forum posts and click MY FEEDBACK."