You visit your new site expecting to see Omeka, and instead you get a setup form asking for a site title, an email, and a password. Do not worry, nothing is broken. It just means the automatic part of the setup did not quite finish, and it is easy to complete yourself.
What happened
When we build a new site, the last step is filling in Omeka's own setup form for you, using the admin email you chose and a password we generate. We try several times in a row. If none of those tries succeed, your site is installed and running, but Omeka is still waiting for those first details. That is the form you are seeing.
To check, open the site in your dashboard and look at the Activity list at the bottom of the page. If the automatic setup did not finish, it says so: "Initial setup for โฆ did not complete automatically โ visit /install on the site to finish it."

Once that message appears, we will not try again on our own, so go ahead and finish it yourself.
Finish the setup yourself
It only takes a minute.
- Open your site's Settings page in the dashboard and find the Admin Email and Password in the Admin Login section. This is the same login described in logging into your site.
- Click Public Site so the installer form appears.
- Fill in the form using that admin email and password, along with a title for your site (the same name you gave it in the dashboard is a good choice). On Omeka Classic, put the admin email in the Username field too. On Omeka S, add your name as the display name.
- Submit the form.
Once the form goes through, you can sign in at the admin address with the same email and password and start adding items.
Using the email and password from the Settings page matters. It keeps the login shown in your dashboard in sync with what your Omeka site actually accepts, so you will not be guessing at credentials later.
If the form will not go through
Occasionally the installer form itself refuses to submit, or brings you back to the same screen. If that happens, do not keep retrying. Open a support ticket with your site name and a note that the installer will not complete, and we will finish the setup for you.
On Omeka Classic, it is also worth a quick ticket after finishing by hand: the automatic setup applies a few hosting settings afterward, and we can make sure those are in place.