A Pop-Up Box is a content box that appears on the screen while you are browsing the web. You can use them to list your email list-building strategies.
One strategy is to include an opt-in form for your list. This is usually found on the sidebar where readers will list their name and email address. Another strategy would be to include a text box at the bottom of each post, or in the header, where readers will list their email address and click “Subscribe.”
BONUS TIP: To maximize the effect of list building, try using a squeeze page. You can use this landing page for your email list – a one-page website committed entirely to list building. Once people click on your Pop Up Box and subscribe, they are directed to the squeeze page where they are asked to give their name and email address in order to receive a free gift related to the content of your post.