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If you really need to "edit csv," you will need to edit the data in a tool appropriate to the source, such as Excel, a text editor, etc. Tableau is not a data editor, it is a visualization tool. Tableau cannot change any underlying database.
That said, you can configure the delimiters Tableau will recognize as the delimiters for your text file data source. In the Data Source screen, click the drop-down arrow on the table, and select Text File Properties:
I hope that helps.