Ok, before we go through the steps on how to create a pie chart with Datawrapper, a word of warning:
Pie charts are visually attractive. They add color, catch the eye. But be award that pie charts are the most contested form of visual representation, with some experts advising to not use them at all.
Pie charts are designed to to compare "part of whole". This works well if you have few parts to compare, like two or a maximum of five. Beyond that number, simply stick to the advise from above and use a bar or column chart instead.