hello, I have a question for 9 axis IMU.

I want to use two 9 axis IMU at the same time.

In compatibility matrix,
"Note 7: Two TinyShields can be used at the same time if the address resistors are changed on one of the boards"

Question 1: how do I change the address resistors on one of the boards?
Question 2: Can I use five 9 axis IMU at the same time?