After choosing the amount , no popup to continue to pay!

I was using this theme:
http://themeforest.net/item/franklin-wordpress-crowdfunding-theme/5063650
and all went okay, but when i click on a pledge ,i choose the amount,and i click on it ,the page goes into a lighter dark color and the pop-up suppose to come to enter pledge amount , and that pop-up box dont come,anyone knows why?

Thanks

http://wordpress.org/plugins/appthemer-crowdfunding/