Problem on installing WordPress

Hi all,

Ubuntu 12.04 desktop 64bit
Wordpress 3.3.1

I was following;
How to Install WordPress on Ubuntu 12.04 LTS
https://linuxmoz.com/how-to-install-wordpress-on-ubuntu-12-04-lts/

to install WordPress. Installation went through without much problem except on browser running;
https://localhost/wordpress
unable to ope PHTML file.

Then I followed
Cannot open php PHTML file
https://www.unixmen.com/cannot-open-php-phtml-file/

install libapache2-mod-php5

Now on browser running;
https://localhost/wordpress/
[code]
Error establishing a database connection
[/code]

mysql is running;
$ sudo netstat -tap | grep mysql[code]
tcp 0 0 localhost:mysql *:* LISTEN 1097/mysqld
[/code]

Pls help. TIA

B.R.
satimis