Superchart can be connected with two different data sources, both Airtable and Google Sheets. If you've already set up Airtable as a source, it's usually easiest to modify Superchart's access to Airtable within Airtable directly.
See Integrating Airtable Data if you're wanting to walk through the first time setup.
If you already have an Airtable connection to Superchart, you can modify the access provided to Superchart (i.e. bases/tables) within Airtable. Just follow these steps:
You can add bases, remove bases, or revoke access to Airtable from the Superchart integration.
WARNING: Revoking access to a data source will cause issues in modifying or refreshing data visualizations associated with that source.