You're missing two very important lines of code, the "command line" and the "hosted button id". The "command line" tells PayPal what type of item button and function to do while the "hosted button id" is how PayPal knows that item button is associated with your PayPal Account. Without those two lines of code, when you click on the Buy Now button, all you will get is the PayPal Login Screen.
Many HTML Editors, web sites and even ISP hosts sometimes don't play well with PayPal's item button code. PayPal's item butto code is simply an HTML Form. What you need to do is find out how your site blog or Editor or ISP host deals HTML Forms. For example, some Editors have to be in a specific editing mode for working with HTML Forms. Should you find out that your site blog will not accept Forms, then you would have to use the email or hyperlink version of the code. The downside of doing that is that you can't use dropdown selections or text input options.
I suspect that your Editor may have stripped out those two lines of code although you copied it correctly. When the code was inserted into your web page, your Editor may have removed those two lines.
Go back your PayPal Account, My Saved Buttons and look at the item button code you generated. You should see two lines of code that are similar to this:
<input type="hidden" name="cmd" value="_s-xclick">
<input type="hidden" name="hosted_button_id" value="XXXNNNXXXNNXXX">
The value for the "hosted_button_id" will have a unique set of characters composed of letters and numbers.
If you look at the code you created, then compare that to the code you have on your web page, you will see that the two lines of code are missing.
