=+Your spreadsheet should recalculate results whenever any changes are made to the shaded cells. If your logic is correct, changing the initial forecast for the exponential smoothing model to 50 will result in new MFE and MAD values of 0.76 and 5.62, respectively. Similarly, changing both weights for the two-period model to 0.5 should result in new MFE and MAD values of -0.077 and 7.692, respectively.