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1. A Chart must exist before it can be used or added to a Dashboard. To create a new Chart from scratch, Click the blue "+" icon from the Charts screen (Views -> Chart).
2. Assign your Chart a Name - This must be unique; no two Charts can have the same Chart Name. Chart names should also not include spaces or special characters.
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Graph Options - Title - This is what will be displayed in the Component window's title bar.
Add Dataset
More information on this can be found HERE: Creating Charts with the opCharts Chart Editor