Simple Chart Usage

I'm trying to make a pie chart using Simple Chart Add-On. Since there are tons of fields i have no idea where to start. What i did so far is, I've created an entity Colors( red(int), green(int), blue(int) ) and added some data. I selected Chart Type as pie I added 3 ChartSeries(for red,green and blue) to the widget and selected Data Source Entity(Colors) So what are the 'must have' fields for a simple pie chart? And are there any usefull tutorial or an example app for this? Thanks,
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