As part of the premium subscription, you can remove Appointlet's branding from the scheduler. This branding includes a banner on the scheduling page and attendee email notifications. To remove them, click on your user menu in the upper right corner of the app and select Settings:
Within your user settings modal, navigate to the General workspace settings. Find the Hide Appointlet Branding section and click the toggle switch on the right side of the window so that it is blue in to remove branding. Hit the Save Changes button and you're good to go!