It's pretty simple, plug it in...

Arduino Drivers available for download at

https://github.com/thingSoC/TSOC_GROVEY_I2CHUB/tree/master/libraries

The default address for the I2C hub is 0x74 with A2 shorted, and A1 and A0 Open.

0 = Shorted, 1 = Open (ie. inverted...)

A2 A1 A0 - I2C Address

1 1 1 - 0x70

1 1 0 - 0x71

1 0 1 - 0x72

1 0 0 - 0x73

0 1 1 - 0x74 (Default I2C Address as shipped)

0 1 0 - 0x75

0 0 1 - 0x76

0 0 0 - 0x77