So basically you set the Popup option to Yes which will expose a series of new options under the title Popup Trigger.
When using the Popup (Modal) system the options in the Popup Trigger section will control what is displayed within the website such as the trigger button etc. All the other module options will control what is display within the Popup (Modal) window when triggered.
If you need more help just let me know.
Hi! I'm Steve the founder and head developer of CoalaWeb design studios. I'm an avid supporter of open source projects and the GPL license.