Mega 2560 + Wireless SD Shield + Xbee S1 = Wifi... How?

I have an Xbee S1 with Wireless SD Shield on Arduino Mega 2560

Can I get Wifi operating on this device ? How?

Can I get Wifi operating on this device ?

No. XBees are not WiFi devices. At least not all of them. There is a WiFi device, from digi.com. with the same form factor as the XBees. But, S1 and S2 modules are not WiFi devices.