Added: Editable variable - Path to catalog directory.

If you are using a default configuration all you need to do is to place the file datafeed_shopmania.php in your /catalog/ directory.

Otherwise, if you place the file datafeed_shopmania.php in another directory than catalog, then you have to open the file datafeed_shopmania.php, search and edit the variable $path_catalog with the path to the catalog directory.

$path_catalog = "./";

Once all is set up you need to check the result and make sure the output is correct.
Point the browser to http://www.example.com/path_to_dataf...a_datafeed.php and look into the source code of the out put
What you need to see is something like this
Category | Manufacturer | Part Number | Merchant Code | Product Name | Product Description | Product URL | Product Image URL | Product Price | Currency

More...