Changing distance when recalibrating treadmill run

After I finish a treadmill run and press Save and Recalibrate on the watch, I'm at a loss how to change the distance on the watch. When the screen opens I can change the distance before the decimal point up and down by pressing the left middle and left bottom buttons, but how do I move the focus to the number after the decimal? If I press either of the right hand buttons it just saves the distance on the screen, which is really frustrating. Thanks for any help...im sure it's something simple that im missing.