Please I need your help I can't fix Move button

guys how can i fix this problem? i only want to move blue line

Where do you want to move the selected edge to?

If you simply move that edge, other geometry connected to it will have to move, too. What is it you really want to do by moving it?

How about sharing your .skp file?

Which version of SketchUp are you actually using? Your profile and screen shot appear to contradict each other.