To make any changes to your marketplace theme, please send us an email at email@example.com with your marketplace URL, login email and the new theme that you would like and we will change it for you. Changing your theme does not change your template (or marketplace type), and will not delete your listings.
You can pick a theme for your template from the link here. Do remember that you'd have to pick a theme that the template corresponds to! For example, you should pick retail theme 1 for your retail template.
Do note that the changes will take 3-4 working days to complete for those under our free trial users. We will try to make the changes within 48h for our paid users.