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Upload to your plugins folder, usually wp-content/plugins/, keeping the directory structure intact (i.e. wp-forecast.php should end up in wp-content/plugins/wp-forecast/).

Activate the plugin on the plugin screen.

Visit the configuration page (Options -> WP-forecast) to pick the number of widgets, data to display and to change any other option.

Visit the Themes/Widgets page to place your wp-forecast widget within your themes sidebars or insert it manually and edit your template file and put the wp-forecast function where you want your weather data to show up. Example: <ul><li> <?php if(function_exists(wp_forecast)) { wp_forecast( <widget_id> ); } ?> </li></ul>

You have to replace with the choosen widget id. For the first widget use wp_forecast("A"), for the second wp_forecast("B") and so on. In most cases it is advisable to put the call into a div environment.

Optional If you would like to have another set of icons download it from http://accunet.accuweather.com/wx/accunet/graphics_icons.htm and put it into the wp-content/plugins/wp-forecast/icons folder

Optional If you would like to change the style, just edit wp-forecast.css there are three classes div.wp-forecast for outer formatting, table.wp-forecast for the middle part or iconpart and wp-forecast-details for everything below the icon