This WooCommerce Extension replaces the "Sale" text for OnSale products with e.g. "Save 25%".
Automatic installation is the easiest option as WordPress handles the file transfers itself and you don’t even need to leave your web browser. To do an automatic install of OnSale Extender log in to your WordPress admin panel, navigate to the Plugins menu and click Add New.
In the search field type “OnSale Extender” and click Search Plugins. Once you’ve found the plugin you can view details about it such as the the point release, rating and description. Most importantly of course, you can install it by simply clicking Install Now. After clicking that link you will be asked if you’re sure you want to install the plugin. Click yes and WordPress will automatically complete the installation.
The manual installation involves downloading the plugin and uploading it to your webserver via your favourite FTP application.