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Elements can be added to your plot, simply tick the checkbox in front of the element name. The ticked elements will be included in the plot. When an element is ticked, the settings menu belonging to that element will pop up. The settings menu will for many elements (navigation, lines/points, scripts, wells, pictures, text) allow input from file(s).
Look at the plot
To see how your plot looks like you can use the Draft Run button. This will produce the PostScript file a lot faster than the Run Plot button, because it uses coarser contouring. To see the plot click File > View plot in Ghostview
Multiple plots
Plotting often involves the creation of several maps. Press the Multi Run button to display the dialog for creating multiple map files. Browse in the names of the savesets you want to run.