Thanks for the question about the plugins. It’s okay if you’re having trouble with understanding plugins as it can be a little daunting if you’re new to the interface and using it. Plugins are used to extend the functionality of WordPress. There are thousands of them. You add them to your WordPress installation by logging into the Administrator Dashboard, going to the plugins section and then selecting Add New. You will then search for a new plugin and then click on Install Now to install it. After it’s installed, you will see the Activate button. You simply have to press it to activate it.
Depending on their purpose, plugins don’t just “appear on your page.” Their interface may simply be in the Administrator Dashboard. If you’re installing BoldGrid, please refer to this tutorial for manual installation.
I hope this helps to answer your question, please let us know if you require any further assistance.