You can show automatically popup on any page or a post.
For example, if you wish to automatically add popup (on load) popup, for example, on "About us" page, here's what you should do.
Follow the steps to get it done:
- Go to the Pages tab on your WordPress admin menu
- Select "About us" page from your list of the pages
- At the bottom of the page you will see a metabox (see screenshot) with all of your created popups.
- Click on the arrow
- Select your preferred one
- Save the page
- You are done!
Now if I go to the "About us" page popup will be automatically shown