Schedule Data Refresh Issues - Power BI desktop

[jessicaf31]

Hi everyone,

I have manually refreshed successfully a set of data  (in green in the screenshot) but when I want to schedule the Data Refresh, it is written (in French sorry) that the last refresh failed ("Echec de la dernière actualisation") with explaination "The credential stored in the cloud is missing".

I already saw the solution proposed here : 

Solution: In Power BI, go to the refresh settings for a dataset. In Manage Data Sources, for any data source with an error, click Edit credentials and sign in to the data source again.

But I can't see where are the refresh settings for a dataset, neither "Manage Data Sources" !! 

Help !