Your Affiliates are kept in your contact manager, when they generate the code to put on their site, they get added to your contact manager and they are tagged as "affiliate"
You can search for all your affiliates by clicking "Manage Affiliates" or by going to the contacts menu and in the contact grid doing a search for "affiliate".
The "Listing Embed Code" feature at the bottom of the page shows you the embed code which you can use to embed your listings page on other websites with or without a tracking code.

