Using a SumoMe, you can set up a trigger so that a List Builder pops up when you click on a link or button. Just go into the SumoMe dashboard, set up a List Builder campaign, and click on Click Triggers in the sidebar menu. There you'll be able to set up exactly which action happens when someone clicks on a button. SumoMe assigns a specific URL for that click trigger that you can then use as your hyperlink for a button.