Let us make some changes to the function and change the color of the plot.
You can edit all functions with the -> menu entry. A dialog appears which lists all the functions that you have plotted. Notice that KmPlot has automatically found a unique function name for your expressions and completed the expression to a function equation.
Select f(x)=x^2 in the list. A double click or pressing the button will show you a dialog window. Here you have access to a lot of options. Let us rename the function and move the plot 5 units down. Change the function equation to
parabola(x)=x^2-5
To select another color for the plot click into the Color: box. Finally press and your changes take effect in the coordinate system.
All changes can be undone until you press in the Edit Plots dialog.
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