WP install - novice

I have just purchased a hosted account, I have been attempting to install WP one-click install custom, my url appears on the install to list, I select url and click “install it now”, error msg " please select URL above" and I’ve just done that, what am I not doing correctly?

Have you added the domain to your hosting plan via DH panel --> Domains --> Manage Domains --> Add Domain?

Manage Domains shows my domain is added and fully hosted…

It should just have it installed. I’ll suggest you to contact DH support via DH panel --> Support --> Contact Support