This article describes how to go from a single-column table (or a single categorical variable) like this...
...to a Pie Chart, like this:
You will need a table consisting of at least one column, or a single variable containing categorical data.
1. Go to Visualization > Pies > Pie.
2. Under Inputs > DATA SOURCE > Output in 'Pages' select the table you want to use.
3. OPTIONAL: Under Inputs > ROW MANIPULATIONS select Sort rows.
4. OPTIONAL: Under Chart > DATA SERIES > Color palette select Strong colors.
If your input table has more than one column, then use Inputs > COLUMN MANIPULATIONS > Columns to show to specify which column you would like to use in your visualization.
To create a Pie chart from a variable, in step 2, instead use Inputs > DATA SOURCE > Variables in 'Data' and select your variable.