To use an ethernet module with W5100 as this:
You need to do the connection below:
Check this topic to see how use the SD slot on TFT.
To use an ethernet shield with w5100, you need connect on this way:
Notice that the pins 10, 11, 12 and 13 are not plugged.
To complete pins that are missing, you can make it:
To prevent conflict between SD card from TFT and SD card on ethernet shield, you must remove pins 50, 51, 52 and 53 of the TFT shield.
Then make a bridge between R16 and pin 4 as shown in the image below.