How to click on string on graph which is every time at different position/place any help would appreciated Thank you!

I am trying to click on a string in the graph (targeted application) which will be any where in the graph ! I have tried click activity but due to target string is moving every time on the graph so it is not works for me. any other suggestions would be appreciated Thank you

When I try to find out that string position using find text position I’m getting below error called ** Find Text Position ‘AWT component’: Text was not found **