Specify the columns to store the indices for Pairwise Averages

Stat > Nonparametrics > Pairwise Averages

Select Store indices in and enter two columns to store the row number of the two values that Minitab uses to calculate the pairwise average. For example, if Minitab calculates the pairwise average with the values in the first and third rows, the indices are 1 and 3.