I created my website with Odoo. I use the Odoo website builder tool.

I have applied for a custom domain name (mondomaine.fr) and it has been accepted and validated.

 In my site's settings, in the "Domain name" section, my domain appears (mondomaine.fr). This means that it is well registered. 

However, my website still has the old domain name (mondomaine.odoo.com). 

How do I change this? To go from mondomaine.odoo.com to mondomaine.fr?