This is not a real object but the result of an internal construction.
For this tool to be used, your figure must contain a frame and a linked point (linked the the x-axis for example).
Use menu item Create - Point on function curve - through linked point.
A dialog box pops up.
Click on the function and the frame.
Enter a name for the abscissa of the linked point in the frame.
Enter a name for the image of the abscissa through the function.
Click OK.
Then click on the linked point to finish.
A new point appears. This point is a final object of a construction named Point on curve through linked point.
In the final objects you will also get :
a calculus containing the abscissa of the linked point clicked.
a calculus containing the image of the abscissa through the function.