To use this in your tables, download, install, and activate this Extension like a regular WordPress plugin. Then change your table’s Shortcode from something like
[table id=123 /]
[table id=123 datatables_counter_column=true /]
Additionally, you will need to add a new first column to that table (by selecting the checkbox below the current first column of the table, and clicking the “Insert” button after “Selected columns:”).
If this Extension is helpful for you, please consider supporting further TablePress development with a donation. Thank you!