Upload the plugin folder boss_banner_ad to the wordpress plugins folder so it looks like /wp-content/plugins/boss_banner_ad/boss_banner_ad.php
Activate the plugin through the 'Plugins' menu in WordPress
For the template tag you need to supply a list of attributes in this order : ( $image, $link, $target, $alt, $width, $height, $nofollow ), example:
For the widget, simply drag and drop the widget into a sidebar, and configure the attributes to how you'd like.
For the shortcode, simply put [banner_ad link="http://www.cssboss.com" image="http://cssboss.com/wp-content/uploads/2012/02/cssbosslogo.png" width="100" height="100" newwindow="yes" alt="CSSBoss.com is the best!" nofollow="yes"]
Requires: 3.5.2 or higher Compatible up to: 3.5.2 Last Updated: 2013-7-19 Active Installs: