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Do you mean the home and site URL fields on the settings page?

Access the phpMyAdmin app, usually through your hosting account. Identify your WP database in the left sidebar and expand it to display the table names. Click on the wp_options table (the “wp_” part may be different if it was changed in wp-config.php). It’s recommended you make a backup SQL file of the table through the export tab before making changes.

Locate the siteurl and home option_name entries. They should be one of the first entries. Click the edit link for each one and alter the problem option_value, then click Go to save your change. Your site will now behave as before.

Yes, exactly.

I did understand, where I can open the database, but apperently, my website doesnt had a database yet.

What should I do now ?

connect FTP (or SFTP if it’s available on your host) to access your site files
Edit your wp_config.php and Add these two lines to your wp-config.php, where “example.com” is the correct location of your site.

define( 'WP_HOME', 'https://example.com' );
define( 'WP_SITEURL', 'https://example.com' );