localhost:8888/wordpress/ not working

Hi,

I have installed MAMP PRO, set up phpadmin for wordpress database, then download WordPress, extract it then drap & drop WordPress folder to htdocs. Then I fill username: root, password: root but it not working won’t set up wp-config-sample? It say
“Error establishing a database connection
This either means that the username and password information in your wp-config.php file is incorrect or we can’t contact the database server at localhost. This could mean your host’s database server is down.

Are you sure you have the correct username and password?
Are you sure that you have typed the correct hostname?
Are you sure that the database server is running?
If you’re unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.”

Does anyone know why, need help please?

Regards,

Shaun.