Apply the moving average forecasting technique for three different periods: $3,4,$ and $5.$ Enter your results for the moving average of $3$ in column D$,$ moving average of $4$ in column E$,$ and moving average of $5$ in column F$.$

Next, use the exponential smoothing technique on the same data. You will use three smoothing parameters: $0\mathrm{.}2,0\mathrm{.}5,$ and $0\mathrm{.}8.$ Record your forecasts for a smoothing parameter of $0\mathrm{.}2$ in column L$,$ smoothing parameter of $0\mathrm{.}5$ in column M$,$ and smoothing parameter of $0\mathrm{.}8$ in column N$.$

Can you please explain more on how to do it and where to input these formulas.