You can edit the branding and company logo to suit the look and feel of the company website, your company colours and logo. This public branding is what subscribers will see when redirected to custom pages, such as successful unsubscribe, update profile, view online version or the complaints page. Access to the branding panel for customers is reserved for admin level users.
Click My Account > My profile > Branding to open the branding panel of your install, for the customer you are logged in as. If you're not able to access branding for your customer, you don't have administrator permissions.