place a voltage probe in each node you want to see, add an analog graph in the schematic, add the two probes in the graph using drag and drop or the right click menu on the graph, double click on the graph to set the duration of the simulation and press space bar while the cursor is over the graph to simulate
If you want to save the graph you can maximize it using right click menu or double click on the graph title bar and from the file menu of the graph select to export the graphic