Datasheet

If you don't get an IP address, check you have a green link light, and that your Ethernet is going out to an internet

connected router. You may also have to set up the MAC address to allow it access, check with your system admin if

you're not sure.

Library Reference

Ethernet2 is fully compatible with the Client (https://adafru.it/lFj) interface and also back compatible with the Arduino

Ethernet library so you can use that documentation (https://adafru.it/lGA) when coding. Just include Ethernet2.h

instead of Ethernet and init() with the chip select pin so it knows what pins to use.