If a recipient of your email campaign decides to unsubscribe using the unsubscribe link they will be taken to an unsubscribe page as shown in the example below:
The logo that is displayed is taken from the logo that is uploaded into your CRM account and is displayed on both the login page and inside your account as shown below:
If you wish to change the logo that the recipient sees when they unsubscribe please contact us with your logo so that we can add this for you.