This is the account you will use to sign in and manage the site. Email verification is not required — you can configure outgoing email later in Settings
Install wizard admin-step intro (installWizard.admin.intro). Guidance copy — not a failure.
Why this happens
Explains that the first admin you create signs in immediately; outbound mail can be set up later under Settings → Email.
Diagnose and fix
1. Choose a strong password; confirm it matches.
2. Create the administrator; restart/sign in as directed.
3. If create fails, see Network error while creating administrator.
4. See First-run install wizard / First admin login.