Installing plugins onto your WordPress installation is one of the easiest things you might need to do with your WordPress.
All you have to do is to log into your WordPress Admin panel -> Plugins -> Add New. You will see tabs like Popular, New, Featured, etc. there to help you filter the plugins and look for some of the most popular ones.
There is a search box, of course, if you are looking for a specific plugin. Under each Plugin you can see its Descrpition, that way if you are not sure about installing it, you can check the details page and it will give you all the needed information for this plugin: its rating, the developers’ websites, documentation, etc.
Once you are certain that you have found the right Plugin for you, click Install Now and it will be added to your WordPress installation.
You can view and edit installed plugins from the Plugins -> Installed Plugins page in your WordPress Admin panel.