Arduino to SparkFun Quad Solid State Relay

I'm trying to connect an Arduino Mega to a SparkFun Quad Solid State Relay. SparkFun Qwiic Quad Solid State Relay Kit - KIT-16833 - SparkFun Electronics

The interface it has has 3.3v, ground, SDA and SCL.

There is also this library which allows Arduino to talk to the device over Qwiic
https:// github . com/ sparkfun/ SparkFun_Qwiic_Relay_Arduino_Library

What I'm not sure though it what pins on the Arduino I need to use for SDA and SCL.

Any help would be greatly appreciated! Thanks

Pins 20 and 21 are SDA and SCL, respectively. SDA and SCL are also broken out to pins by the ground by pin 13. See reply #12 of this thread.

For what are you using the relays?

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