Hi spider, sorry you're having trouble.
There are actually no preferences or anything for the Camelizer at the moment. After install, all you have to do is go view a product page at one of the supported retailers (try this
http://www.amazon.com/gp/product/B002IPFWTE ) and the Camelizer will show up on the left side of the page. Click its button to show the price history charts.
Please let me know if you're still lost, I'll try to help you out further :]