Thanks for the question. It really does depend on how or what system you are using to develop your website. The website that I saw on your account was using OpenCart. If you are referring to that installation, then I highly recommending checking their extensions page here. You can find a variety of extensions that will help with your FB button. The extensions will give you much more flexibility than just the simple Facebook button.
Please let us know if you require any further assistance!
Thank you Arnel. I did find the OpenCart extensions page but then I still don't know what the heck I need to do. (I'm a critical care RN and not at all a computer geek - PLEASE help me!)