It's quite simple to remove any account linked to your Kogan login, and can be done through the following steps:
1. Once logged in, navigate to your account settings and you will see an option in the drop-down menu for 'Linked Accounts'.
2. Once you have clicked on this, it will take you to your linked accounts.
3. Select 'Unlink Account" under the account you'd like to remove to complete this process.