You can edit a connection to a service already created?
Or do I have to delete and recreate the connection?
Thanks for the help
You can get the list of connections in your flows from https://flow.microsoft.com/manage/connections.
You can't edit the existing connection, you need to create a new connection and edit the flows as required.
I think your scenario is that you have many flows and trying to change the connection credentials without editing the existing flows. If so, consider submitting your request to Flow Ideas.