The content for your alert is edited in the section (Content > Sections) Alert Message. 

You can any kind of text, links, or buttons in the content field. Assign the image you'd like to display via the image field. 

You can swap out the alert's content anytime you need to!

To turn your popup "on", simply keep the name of the section as-is - so leave it as Alert Message.

To turn your popup "off", simply change the name of the section - we suggest something like Alert Message Off. 

In order to turn it back "on", change the name back to Alert Message whenever you'd like. 

The code for your page searches for a section Alert Message, and if found, displays the content inside. Changing the name of the section "breaks the code" and therefore removes your popup from appearing.