MKR zero Ethernet

I would like to integrate a w5100 board on arduino mkr zero or on mkr1000 but I can not because I have to modify the libraries and change the SS pin for SPI ..
Does anyone know how to do?
Thank you

Maybe you'll want to consider the Adafruit Feather with Ethernet FeatherWing Adafruit Ethernet FeatherWing : ID 3201 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits

thanks for the reply .. I would like to use my mkr if possible ...