Can't find the PIN of this product

Good morning. There is no PIN to find on the router. You get the PIN from the Wireless client and enter into the router setup screen.
The wireless router supports two types of WPS, the WPS via Push Button and WPS via PIN code. If you want to use the Push Button, you have to push a specific button on the wireless client or in the utility of the wireless client to start the WPS mode, and switch the wireless router to WPS mode. You can simply push the WPS button of the wireless router, or click the 'Start to Process' button in the web configuration interface. If you want to use the PIN code, you have to know the PIN code of the wireless client and switch it to WPS mode, then fill-in the PIN code of the wireless client through the web configuration interface of the wireless router.

Here is the link for the Owners Manual for your router..
http://www.encore-usa.com/us/sites/default/files/product_documents/ENHWI-N3_UM.pdf

Hope this helps..