Deleting a dataset
To delete a dataset:
From the main menu select Data Sources
In the Data Set dropdown, select the dataset you want to delete
You’ll see a list of the data sources that belong to that dataset.
A new dataset won’t have any data sources yet.
If the dataset has data sources, delete them
You have to delete them one at a time.
When the dataset no longer has any data sources, click the Delete it link that appears