WordPress.org

1. Upload the osCommerce directory to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Once activated use the osCommerce admin section to add your shops' details as per the fields available (They are self explanetory).
4. In 'Design' -> 'Widgets' add the widget to your sidebar (Only after step 3 will you see anything displaying in the widget). The recommended placement is just under your wordpress category listing.
5. Create a page call it what you wish e.g. 'Products' and add the following to its content section: [[oscProductListing]]
6. Publish the page and now you're ready to display product listings.

And you're done!!!

    When updating you will need to deactivate and reactivate the plugin.