This part needs a bit more explanation. I for one have no idea how to scan QR codes with an iPhone and how this ties into configuring the WiFi settings on it.

This part needs a bit more explanation. I for one have no idea how to scan QR codes with an iPhone and how this ties into configuring the WiFi settings on it. When someone with an iOS device scans it, it will automatically download a wireless profile to their device to auto-connect to your wireless network (SSID & key automatically inserted).