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#1  

The BlinkM is an I2C device so therefore you connect it to the I2C port.

If you have a V3 EZ-B it will plug directly in to the I2C port if you want to or you can run wires to it if it's away from the board.

If it's a V4 you can connect to any of the three I2C ports.

#2  

it works!:)