To submit an item for monitoring you must provide the vendor name from a drop down list and an item ID. The images below show how to figure out the item ID for several of the supported vendors.
In this example for newegg.com, the item ID would be N82E16855501028

In this example for buy.com, the item ID would be 209337198

In this example for amazon.com, the item ID would be B001O0EGD2 which is usually after dp/
