I didn't know there is a window just to plot histograms. Smarter every day. Anyway, if you have results (calculated expressions) in "Yield" view of the results just click with right-mouse button on one and choose Plot Histogram. Or there is a histogram function in the Calculator, you can even calculate the standard deviation with an expression from the calculator.
If you still have a problem please be a bit more specific, what is the error log, or which is that step where you stucked. I don't get it why you cannot plot from above description.