Not able to enter data source credentials

thanks ibarrau 

I think that is not exactly what I was looking for. We would like to make automatic refreshes in Power Bi service of Excel files that are stored in a sharepoint. To do this, we need to re-enter the credentials for Sharepoint in the semantic model settings under "Data source credentials". A colleague of ours was able to do this. For me, however, this function cannot be selected at all. I am not able to do what is described here: https://learn.microsoft.com/en-us/power-bi/connect-data/refresh-data#accessing-cloud-data-sources