First thing you have to do is point your browser to installed directory like http://<install_domain>/<install_path>/index.php/install/install/.

After pointing your browser to this URL you will see window like this.

At the second step of the installation you will have to fulfill database settings

At the third step of the installation you will have to provide the basic configuration.

At the last step of installation you will see window screenshot provided below

If application was already installed you will see screenshot provided below