If you purchased a domain through Rela the connection to your property website should happen automatically; you shouldn't have to do anything.
Just be sure that your property website is Published. Only Published websites are viewable to the public.
Please note that it may take up to 15 minutes for the new domain purchase to register across the entire internet and fully connect to your single property website.
If after 15 minutes your custom domain is still not working and your property is Published, please contact us again with the details.