Push New Campaign button and then create Sales Popup campaign.
Create memorable campaign name that you can distinguish later
Now you see random Sales Popup set by default. So let's get started:
Set the Goal - you can go without it to be honest. It depends of your desire to make it more results-oriented from collecting emails to just viewing of content. In order to learn more about how to set goals for your campaigns, I would like to recommend you to read a separate guide on how to set goals and why do you need that;
Design your campaign add text message, change colours, patterns. Place it on the bottom/top/right/left, turn black theme on. Make it look fancy. You can even set your original product's url to increase its quality;
In Behaviour section you may set where and when Sales Popup should appear. By the way in case you have any bugs we have preventive measures to take
Schedule campaign in Settings section;
Choose type of device on which you're planning to run your campaigns, put your page's URL and include or exclude locations to show the campaign