Good app, could be better – Pie Diagrams by iMathics Review

This is a good app and can be useful. However, i noticed that once you save it, you can't really add more colors beyond my knowledge. I looked for a good 10 min., but couldn't find anything. If it is an option and I missed it, please make it more obvious. Thx :)
Review by Jasonpching on Pie Diagrams by iMathics.