To create a database and an owner with a password in PostgreSQL, you can follow these steps:

1. First, make sure you have PostgreSQL installed and running on your system.

2. Open a command-line interface or terminal to execute the necessary commands.

3. Connect to the PostgreSQL server using the `psql` command with the following syntax:

>>> psql -U postgres

This command assumes that you are logging in as the default PostgreSQL superuser 'postgres'. If you have a different superuser, replace 'postgres' with the appropriate username.

4. Once you are connected to the PostgreSQL server, you can create a new database using the `CREATE DATABASE` command. For example, to create a database named "mydatabase," run the following command:

>>>  CREATE DATABASE mydatabase;

5. Next, create a new user with a password using the `CREATE USER` command. Replace 'myuser' with the desired username, and 'mypassword' with the desired password:

>>> CREATE USER myuser WITH PASSWORD 'mypassword';

6. Grant all privileges on the database to the user you just created using the `GRANT` command:

>>> GRANT ALL PRIVILEGES ON DATABASE mydatabase TO myuser;

7. Finally, exit the PostgreSQL prompt by typing `\q` or pressing Ctrl+D.

That's it! You have successfully created a new database and an owner with a password in PostgreSQL.