If you click up here you can select a built-in dataset.

If you click here you can upload or paste your own data set.

The dataset must be in the format ".csv" to work in NZGrapher

Once the data is loaded, select the graph type, and for this topic you select "Dot Plot (and Box and Whisker"

Once you have selected the graph you need to select the variables.

For variable 1 it must be numeric (number-based) as the message suggests.

For variable 2 the groups that are to be compared are selected.

Once the graph appears the number summaries and box plots need to be applied to the graph. To do this these two boxes must be selected.