Right click the data source in the upper right and you will see "Edit Datasource".
I think you misunderstood my question. How to bring up data source is not the question. Bringing up the data source does not bring up the data interpreter option. See below:
The highlighted area is where the option to turn on the data interpreter typically comes but it does not for me.
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Ohhhh, I see. According to Tableau, that is not available if Tableau doesn't think it needs help.
That being said, you can easily change the first row to a header line, like you mentioned in the post regardless.
Basically, click the "down" arrow next to your sheet name and select "Field names are in the first row" instead of "Generate field names automatically".
(Screenshot below, from the page)
- The data source is already in a format that Tableau can interpret: If Tableau Desktop doesn't need extra help from the Data Interpreter to handle unique formatting or extraneous information, the Data Interpreter will not be available