Cannot modify or delete data source after creation
Documentation mentioned check boxes and edit and delete buttons not there.

Hello,

Open "ARI Smart Content -> Data" page on component backend then select a tab with appropriate data sources category (for example for data from databases and CSV files, select "Database data" tab) and click by "SQL Queries" link if want to manage (add, edit, delete) data sources from database, click by "CSV Files" link if want to manage data source from CSV files and etc. Documentation is available here.

Regards,
ARI Soft

Did not think to look under "Components" to find this - able to edit them now.

Look & feel a little different from earlier joomla & ari apps.

Thanks