Custom Branding is a PRO feature.
By using Custom branding you will remove the "Powered by Maître" footer from all emails, including Confirmation email and all Engagement emails, and add your own footer.
In addition, the referral link created in the widget will have your own domain instead of maitreapp.co.
Custom email footer
To change the email footer, go to "Settings > Advanced settings" and add your custom footer. You can also use HTML, for example to add a link as shown in the example below.
Don't forget to save when you are done!