Hi Wayinda,
We moved the documentation to the official Mendix documentation
https://docs.mendix.com/howto/extensibility/charts-tutorials
https://docs.mendix.com/refguide/chart-widgets
You could take a walk trough with this how to
https://docs.mendix.com/howto/extensibility/charts-basic-create
Cheers, Andries
Use chartjs from Mendix app store.
you can follow documentation for configuring.