Mike D, I have the same router except it’s a V4. Sounds like the menus are arranged a little different.
I had to go to ‘Status’ ‘Local Network’ ‘DHCP Clients Table’ to find the IP and MAC address. I did this earlier and added the MAC to ‘Wireless’ ‘Wireless MAC Filter’ ‘MAC Filter List’.
It still didn’t work On the ‘Wireless MAC Filter’ page is a setting to either ‘Prevent PC’s listed from accessing the wireless’ or ‘Permit only PC’s listed to access the wireless network’. Once I permitted the ‘PC’ to access the wireless network did it start working. The Linksys router thinks that the iFly is a wireless computer.