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Select something appropriate as increment on the axes. Then press the action button "Run plot" and your plot will be generated in no time. Note that Geocap is set to 2D mode when plotting. Open the postscriptfile in a viewer e.g. GhostView and look at the plot. At those point you may also introduce the "Gray Frame", activated from the pulldown File > Preferences. Toggle the option "Gray frame around plot and also "Extend grayframe - Length in cm:" and set the length to 6. Rerun and have a look at the plot. Remember to press the "Save Saveset" now and then to save your work.
The Plotting Main Axes and frame Panel