One thing most businesses creating a website will want an email opt-in form on the site to capture leads. An email list lets your business stay connected to your customers and clients. You can use the list for newsletters and special offers.
The Magic Action Box WordPress Plugin is an effective way to add an email list to your site.
And here is a YouTube video that can help you use the plugin: Add A Custom Email Opt-In Form To Your Website (WordPress & Magic Action Box Plugin )