Deactivate the plugin in the WordPress 'Plugins' menu if you are upgrading
Download and unzip the plugin
Upload the wp-opt-in folder to the /wp-content/plugins/ folder
Active the plugin, place the widget in your sidebar and edit its title by using the 'Presentation' menu
Configure the plugin in the 'WP Opt-in' menu located under the WordPress 'Options' menu

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How and where do I upload the wp-opt-in folder to the /wp-content/plugins/ folder and what is all that???

Clearly I'm missing something.

Regarding..... Assignment Help
Thank you in advance for your answers.

Hello Billy!

Please note, that WordPress Opt-in plugin is not a Web-Dorado product, and we are not familiar with its code. Please contact their support team, and let us know in case you have questions for our plugins.

Thanks! Have a good day!