If you already own a domain that is currently managed by a registrar such as OVH or Gandi, you need to inform your registrar that you want to use the domain on your new Orson site. It's called domain redirection and it's easy to set up online.
How to change your domain DNS settings?
You have to login to your account at your current registrar and change the settings of your DNS ( Domain Name system ).
login to your user account at your current registrar
go to the DNS edition zone
look for a row that starts by www and has a type CNAME
replace the current value by «gateway.orson.io».
once it's done, return on your Orson account
go to the settings
paste your domain in the domain name field
In case you have any questions, don't hesitate to reach out on the support chat!