If you want to stop using Conrad Connect with your current WiZ home, you can go to [+Devices & Services] at the top of the Conrad Connect Website > under [All Devices & Services], find WiZ > click Edit (pen icon) > Click [Revoke access] to unlink.
If you want to fully delete all link and data associated with Conrad Connect, this can be done by tapping on the “Unlink” at the bottom of the Conrad Connect integration screen in the WiZ app.

Android:
iOS: