Once a fetch is set up it cannot be edited.
If you wish to make an amendment to an existing fetch, delete it and then re-add it again with the updated details.
To delete an existing fetch, login to the Feefo Hub, set the correct account using the global filter (only needed if you have access to multiple accounts) and go to 'Sales > Data Sources'. There you will see a list of the existing sources similar to the below screenshot:
Click on the 'Delete' button to delete the fetch and then add a new one by clicking on the 'Add Data Source' button in the top right corner of the screen.