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Go to Models & credentials.
Click Add credential to create a new credential;
Select the Azure application for SharePoint credential type;
Give a name to Name your credential, e.g. SharePoint Azure application Jean;
Select who to share the credentials with. This will determine who can use your credentials in the data sources. If you want to keep these credentials private, select Only me. If you want to share them with other builders, select Builders.
Provide the Tenant URL of your SharePoint, for example,
https://company.sharepoint.com.Provide the Tenant ID of the application.
Provide the Client ID of the application.
Provide the Client secret associated with the given Client ID.
Click Create.
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Learn how to create a SharePoint content data source that uses your credentials by reading this page: SharePoint content.