You'll need to connect 4 wires from the Adafruit IMU to one of the Modern Robotics Device Interface Module's "I2C" Connectors:
- Power (+5V)
- Ground
- SCL (I2C Clock)
- SDA (I2C Data)
Here's a
link to a tutorial on connecting the navX-Micro Robotics Navigation Sensor to the FTC system, the steps are very similar. Ignore the information about the USB interface, which is not present on the AdaFruit IMU.