Installing a plugin in WordPress is pretty straightforward, using the plugin repository available on the administration interface.
First step, move your mouse over the Plugins menu of the administration interface, and click on Add New
You’ll then see the plugin repository. In the search bar on the top right, write a keyword or the name of the plugin you’re looking for, in below example footable, and results will be automatically updated.
Click then on the Install Now button of the plugin you’d like to install
The button will change to Installing… while WordPress is downloading and installing the plugin
When done, you will have to click on the Activate button for the plugin to be activated
On the Plugins menu main page, to which you’ll be automatically redirected, an information message will mention Plugin activated., and you can now see your plugin…
… and you can access the plugin’s Settings through a direct link