Here's how to leave feedback for a fellow WGO member:

1a) Search for the member's profile in the WGO Member List and find the feedback number near the center of the page. It looks something like: 1 (100%). OR:
1b) Find a post that that member has made and look for the feedback number under his/her name and avatar.

2) Click on the feedback number.

3) Leave the appropriate feedback. The default is "positive," I'm sure you'll NEVER have to change that for a WGO member . . . but I'm too much of an eternal optimist, so the option does exist to leave neutral or negative. Choose the role that the OTHER person (not you) played in the deal: Seller, buyer or trade.

And wallah!!, as they like to say on internet forums!