If you configure something through the UI, there will be nothing written to the configuration.yaml file. The configuration data for the UI is stored in the folder .storage.
Hmm, I’m not sure on this one, maybe you need to remove the integration and add it again with the new address or it may be possible to change this in a file in the .storage directory.
Why do you need to change the address? Did you plug the stick into a different port and it changed the address? If so, I can recommend taking a look at udev rules to create a persistent address, no matter which USB port you connect the stick to.