To install the plugin. Follow the steps given below
Step 4) On the Add Plugins page, type in the name of your plugin in the search box on the right-hand side, at the top of the page.
Step 5) From the Search Results page, scroll down to your chosen plugin and click the button marked Install Now. If you would like to learn more about your plugin, click the blue link marked More Details
Step 7) Once activated, you will be redirected to the Installed Plugins page. From here, you can read all the info about plugins.