In an effort to organize the feedback, please look to see whether or not the person of whom you are leaving feedback already has a thread committed to their name.
I believe handling feedback posts in this manner will provide a better service to the members of the forums who would like to view another members feedback (if applicable) before buying from and/or selling to.
If a thread does not exist for the member in which you'd like to leave feedback for, then please make an initial post (vice reply) with a Subject of their forum name only!