Thanks for posting in the PayPal Community forums for help with this Smart Buttons issue. I'm sorry to hear that you are having a difficult time integrating smart buttons to your website!
Sometimes, this kind of thing may require a web developer if you're not very experienced with this type of feature. I know I'm not a wizard when it comes to coding.
However, PayPal does offer support with integration and technical support issues. If you contact them and provide your PayPal email address, your shopping cart provider, web host, etc., they should be able to help you troubleshoot the problem. I hope you're ready for business ASAP!
As you slide down the banister of life, may the splinters always point in the right direction. - Irish Proverb