Navigate to Creative Popup / Popups page on your backoffice. After that click on the Add new popup button (you can find at the top-right corner), then the same modal will appear what you can see in the image bellow. Give a name to your new popup, and click on the Create Popup button. (It's also possible to leave this field empty, later you can change its name.)
Add new popup
To create a new popup you have 2 options: Create an empty popup from scratch, or Use an existing template as a base. The first option is recommanded for experienced users. In this article we will continue with a starter template. You can preview any template, just click on its image and wait a sec. After selecting one, you can grab it using the Import button.
Create empty popup or choose a start template
Now you will be redirected to the popup editor view as you can see in the image bellow. Check your brand new popup: move the mouse over the monitor and a Live Preview button will appear, just click on it.
Popup settings view
The popup template is ready for your changes, configure it for your needs. When you are ready, don't forget to click on the Save button at the bottom of the page. You can also use shortcut: press [Cmd] + [S] on Mac or [Ctrl] + [S] on other platforms like Windows or Linux.