Wireless Router as a Simple Switch and Access Point

Need WiFi?
Often, there are perfectly good networks that don't have WiFi capability - and there's a need to add it. 
- Perhaps you have an Ethernet port into a network but no WiFi nearby.
- Perhaps you have a powerline extender and no WiFi at the far end.
- And you still want all the computers an devices on the same network LAN subnet.
This calls for an Access Point.
But maybe you already have what you need or don't have the wherewithal to buy and configure an access point.

Add WiFi with a Simple / Commodity Wireless Router 
Perhaps you have a perfectly good WiFi-capable router around.  Maybe it was replaced when the latest ISP modem was installed with its own WiFi.  With the idea that a picture is worth a thousand words, we drew this narrated diagram to help show how to add WiFi with simple commodity wireless routers - and without the complication of a lot of networking knowledge.  

Wireless-Router-as-a-Simple-Switch-a.pdf