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You will see small points or nodes every where on the screen.There is an option down there when user will click on shortest path option and then point your cursor to any node then you will see a highlighted path .This will happen for every node user point. The colour of that node will also change.
check the attached picture.
If you want to bid then just write "done" so that i can understand you have gone through my requirement properly.don't bid here blindly.I have many projects.selected freelancer will be given many work in future.don't cross my budget when biding here.its a simple work.