Upload 'weather-press' unzipped folder to the '/wp-content/plugins/' directory or simply use the wordpress installer to install the zipped plugin file. The following video explain in details how to install a wordpress plugin.
Activate the plugin through the 'Plugins' menu in WordPress.
Now you are ready to use your weather press as a plugin or as a widget.
Video tutorial :
The installation steps of weather press are the sames as installing any other wordpress plugin.
Weather Press, How to use ?
To use weather press as a plugin just put the shortcode below anywhere in your theme's PHP file: