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When your brick is connected to your device, in the upper, left corner of your programming canvas, you will see icons that represent things that are plugged into the brick's various ports.
If you click on the icon of the brick, it will open an expanded view.
You will need to click on the icon for the motor you want to use, and select "RELATVIE POSITION" as shown below.
Note that the value for motor C changes when you do this because it is switching from an absolute position, to a relative position. A wheel is a circle that has only 360 degrees. Each location on the wheel of the motor is assigned an absolute value between 0 and 360.
However, you may want your motor to turn a lot more than 360 degrees, so you will need to find the RELATIVE POSITION. The relative position is how many degrees the motor has turned in total from a chosen 0 point.
Now that you have your motor in your hub connection set to relative position, you will need to tell your robot to set the current position to zero (0).
You will do this using the stack to the right. If you do not have the blue MOTOR block pictures, you will need to add the extension blocks "More Motor Blocks" to your programming palette.
Note that when you play the stack, the value for motor C is changed to zero.
Now that the motor is set to zero, you can gently roll it by hand the distance you would like it to travel. Because it is set to RELATIVE POSITION you are able to measure distances greater than 360 degrees.
You can use that number to program your robot the desired distance.
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