In our welcome email and redeem landing page you can customize it with your logo (and also a message and a button).
If you already have your logo hosted online you can enter the URL in the configuration:
If you don't know the URL to your logo or you don't have one at all you can use a free service like https://postimage.io/. They allow you to upload your logo and receive a URL that you can use in Coupon Carrier.
We recommend that the logo is less than 500px wide to fit nicely.