After you have followed the steps to set up new Criteo credentials you can use those to reconnect or connect new sources for the advertisers you gave access.
You can also control what access you have given at Criteo Consent Portal.
Setting up new Credentials
Press either reconnect or connect a new Criteo source, then press New Credentials.
The next step will take you to Criteo's consent page where you will select which advertisers the credentials you create have access to.
The credentials created will have access to the advertisers you check during that consent selection but will not have access to already granted advertisers.
After pressing approve the next step is either to select sources you want to connect or the reconnect is finished.