How to install WordPress plugins
There are two ways to install WordPress plugins: using the Dashboard’s built-in installer or downloading and uploading the plugin manually.
To use the automatic installer, log in to your Dashboard, go to Plugins > Add New,
find the plugin you want and click on the Install Now link under the plugin’s name.
To activate the plugin, go to Plugins > Installed Plugins and click to Activate.
Remember to read the information about the plugin because you might need to do something extra to make it functional.
You could also go to the WordPress official site to install the plugins.
Go to the plugins section, click on the download button, unpack the archive, then upload the new plugin folder to the WordPress folder,
and in the plugins directory: wp-content/plugins.
Activate it from your Dashboard and make any additional modifications if necessary.