You can change it after installation.

Add the root domain – domain.tld. Once the blog is up, DNS set correctly, log into the WordPress dashboard and change both URLs under Settings-General. You’ll need to close your browser and clear cache for the dashboard login to work.

If the URL was mistyped and made the blog unavailable, see here how to fix it.

Still need help?

 Contact Support  Ask SEO/PBN Question on Facebook Group