Adding WordPress plugins is a breeze normally thanks to the inbuilt plugin browser, but what happens when you need to install a plugin from source or it is not available through WordPress.org?
You can actually upload plugins directly to your WordPress installation through your favorite file manipulation medium. You can upload plugins by FTP, SFTP, Web Uploader and more.
To add a new plugin visit your /wp-admin/ administration panel. You will see upload upon page load,.
you can then upload any plugin zip files to be installed manually by WordPress.
After installation, you can activate and configure the plugin as you would normally from one installed from the Plugin Browser.