Trigger: On Click

Want the popup to come up only when a certain thing has been clicked on? You can do that with Hollerbox.

When you go into edit your popup, then click on Triggers.

Inside the Edit Triggers, you will want to turn on On Click. Then you will want to enter the element you want the popup to show up on afterward the click. You can select if you want the popup to only come up once or multiple times.

When you have the triggers how you want, you can close the Edit Triggers (top-right corner), then save / publish your popup.