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The control wire of servo motor (yellow wire) should be on pin 7 and the LED should be connected to pin 5, the servo motor is connected to the voltage source of the mega card 2560 with its red and black wires 5V and 0V (GND ) respectively.
The following LINK is the code to be loaded on the Mega 2560 development board, is in my GitHub repository.
Is important chech the IP address of your modem from the windows console and with this IP address asign an address to w5100 module into LAN range to communicate properly .
The following video describes how they should assign the IP address and the web server functionality of the W5100 card:
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