EZPayPal No Respnse

I installed EZPayPal on my site “FitnessByLeslie.com”. I made it through the set up phase and have it offering the options I plugged in on the admin page. Unfortunately, its not redirecting nor moving at all when i test by clicking the “Buy Now” tab. The page refreshes and stays on the same page that I was just on. I have reviewed other posts on this topic and they either apply to something slightly different or are written in coding language that I dont comprehend. Is there a basic explanation (that my pea brain will understand) of how to correct this?

Thanks.

Scott