Can I change the data source connection type for a dataflow?

[Anonymous]

I inherited a Power BI dataset that is created via dataflow that calls an API. My colleague left and I'm having trouble updating my credentials. I've submitted a service ticket to the API's company, and then stumbled into the power query editor in the web service after clicking 'edit' on an entity in the dataset. I was asked how to connect to each entity and selected anonymous (which is how the API works with Power BI for us) and my tables loaded. However, for one table/entity, I selected basic and now I get this error: 

"Expression.Error: The 'US-Customer-Api-Key' header is only supported when connecting anonymously. These headers can be used with all authentication types: Accept, Accept-Charset, Accept-Encoding, Accept-Language, Cache-Control, Content-Type, If-Modified-Since, Prefer, Range, Referer"

Is there a way I can change the data source type back to anonymous?

[Greg_Deckler]

@Anonymous Go to File | Options and settings | Data source settings. Choose the data source and then Edit Permissions...

[Anonymous]

@Greg_Deckler - In the service-based query editor, there's no 'File' option in the menu (see screenshot). Would I need to change it in the desktop file, which is connected to the dataflow?

[Greg_Deckler · Accepted solution]

@Anonymous No, open Settings for the dataflow and there you can edit the Data source settings.

[carerix]

Hi Greg_Deckler,

I which part of the Power Query menu in Power BI Service can I find the option "Settings"?

Could you send me a screenshot to help me?

Best regards Louis