Hi shana,
sorry but this is not misleading. One thing is a html template and other thing is a WordPress plugin.
If you read the category of the theme, is a html template, it can’t be used in a WordPress installation. If you want to use it, you have to edit the html files and upload them to your FTP.
But, if you have a WordPress installation, you can’t use a html template. You need a WordPress plugin.
Therefore, there are two different options.
Regards