Merge pull request #294 from mason5052/codex/issue-289-web-ui-account-guidance

docs: clarify web UI account setup

Author: asdek

README.md

@@ -788,6 +788,17 @@ docker compose up -d
 
 Visit [localhost:8443](https://localhost:8443) to access PentAGI Web UI (default is `admin@pentagi.com` / `admin`)
 
+#### Web UI Accounts
+
+PentAGI does not expose public self-service sign-up from the login page. A fresh installation creates the default local administrator account:
+
+- **Email**: `admin@pentagi.com`
+- **Password**: `admin`
+
+On first login, change the default password before using the instance for real work. If the administrator password is lost later, use the installer maintenance menu to reset the default `admin@pentagi.com` account password.
+
+For multi-user setups, an authenticated administrator can manage local users through the Users REST API (`/api/v1/users/`). The OpenAPI UI is available at `https://localhost:8443/api/v1/swagger/index.html` after the instance is running.
+
 > [!NOTE]
 > If you caught an error about `pentagi-network` or `observability-network` or `langfuse-network` you need to run `docker-compose.yml` firstly to create these networks and after that run `docker-compose-langfuse.yml`, `docker-compose-graphiti.yml`, and `docker-compose-observability.yml` to use Langfuse, Graphiti, and Observability services.
 >