How to display the popup few seconds later loading the web page?

I did this but the form doesn't pop up except for when I go into the lightbox option and click on the box that says display upon loading the page.  I want the pop up to display upon visitor leaving the website or 10 seconds after loading page. 

It is possible to display the lightbox after loading the web page. Please refer to the guide below that can help you achieving this requirement.

https://www.jotform.com/help/203-How-to-Auto-popup-a-Lightbox-Form

Let us know if you need any further assistance. We will be happy to assist.