Plugins are small programs that you can add to your WordPress website to expand its functionality, these plugins can do anything from making it easier to add Google Analytics to your website to turning it into a full blown eCommerce website.
To add a plugin to your site follow these simple steps .
1 . In the dashboard click on “Plugins” and “Add New”
2. Use the search function in the top right to find a suitable plugin.
3. Select the plugin you want, look for a high number of active installs and star rating then click the [Install Now] button.
If asked for your ftp password enter it, or take a look at this post explaining how to store it permanently.
4. Click the [Activate] button to complete the installation, some plugins will require further configuration before they can be used.