You can edit a data source using the following steps:
Data Source button in the configuration panel.
Select a data source listed in the data panel that you need to edit.
Click the highlighted icon to edit the selected data source.
Now, the respective data source will be opened in the data design view to handle the modification.
After modification, click
Save in the tools pane in data design view to navigate to the dashboard design view as highlighted in the following image.
If you are still not able to find the information that you are looking for in the self-help resources mentioned above then please contact us and send your requirements.