Main Index - PhotoPost Classifieds
Feel free to register on that clean test site and play around as you wish. You should be able to post an auction by posting in the for sale forum and click allow bidding.
The application which is not a mod but a full featured program that can be installed alone or installed to integrate with twenty or so different forums to achieve an integrated login or more depending on the type done.
Feel free to ask any questions you like and I will do my best to assist you.