Attach the router to the laptop with the wireless dongle using an Ethernet cable. Allow the laptop to connect automatically to the router gateway and have the router assign dynamic DHCP addresses. At the laptop you will need to open the network control panel and bridge the two adapters, highlight both and right click and select bridge connection. Now the laptop will share the wireless Internet with the second subnet attached to the router, which can then allow phones/computers/tablets to use the bridged wireless Internet.
The laptop must remain on for the bridge to work.